This isn't a joke. I dreamed about this, and it was vivid and even a bit exciting/scary in places until I woke up.
I know just how unlikely (or even unfortunate, given 
) such a sequel would be, so if it helps to imagine what I just dreamed about, you could see it as a "spiritual" sequel, maybe unofficially done and probably not written nearly as well, though still starring the same protagonist 
It started with 
waking up leaning dangerously over a balcony rail, drugged (though perhaps for continuity reasons depending on the first game's playthrough, it's implied to be not through any fault of his own) just outside of an ambitiously graffiti-tagged morgue. A wild party had just winded down inside; someone very unpopular in that part of town had died and even the morgue's employees were glad to be rid of them even while preparing the body.
While it seems like a disservice to the actual DE game (I didn't voluntarily come up with this dream), this one was in first person, so the first thing I saw after the opening narrative vibes was a breathtakingly beautiful early morning sky just after the break of dawn, with clouds shaped and colored like lava lamps swirling together.
The 
thing chimed in and told me that those beautiful clouds were from local industrial waste; some pharmaceutical corporation made its stuff in the region and dumped its byproducts in the water.
That was also why woke up so thirsty and yet everyone he then asked for something to drink said that they already had "the good stuff" during the party and that the stuff coming out on tap was only good for washing, not for drinking (yes I woke up very thirsty).
I got very little useful information from 
it seemed, because none of the too-tired-to-cooperate partiers wanted to explain how my character got there, why he was there, or even who was killed.
The body had signs of being attacked by some kind of cryptid, at least I could tell that much. Then I got some dream-driven 
narrative-in-the-dream vibe that the cryptid was coming back, would kill again...
And that I knew who the next target was, and it would happen, if the case was unsolved, by sunset. Hehe, I'm in danger! 
I woke up shortly after that. I rarely get dreams that vivid or that specific or that cohesive, so I was impressed with my feverish recently-medicated brain for the good time. 
He could criticize the treat brain, but in the end he could not save himself from it.
- I do have my own treats, have not said otherwise, and I can even enjoy treats while accepting the existence of their problematic elements.
spoiler
DE is almost flawless as far as I'm concerned, though.
Only thing I will add. I sometimes dream of games that dont exist...then I wake up and am sad for a short bit that I will never play them.
I've done that. One of them was a Master of Orion-like space strategy game, but it started with first contact with an already-spacefaring alien race, and a sort of uplifting of society into joining them and their cause.
Random Disco Elysium sequel idea I came up rn on the fly
Harry DuBois wakes up with the sound of construction nearby after having drank for the first time in months - a relapse in his sobriety - after having received the news that due to the damage to his body he would not have that much longer to live on earth. The doctor was very vague as to how much he'd have left and that anxiety was driving his negative emotions into overdrive.
Looking outside to see the workers toil in the heat wave sun with sweat-drenched foreheads while conversing in an unknown language, Harry spots Kim arriving to his home to pick him up for the job. They are already in the middle of a case, the investigation of a series of high-value vandalism in the industrial sector of Revachol but so far the leads have been to nowhere; the perpetrators have been hiding their tracks really well and there are differing opinions on who was the culprit. Some blame Mazovians, others blame foreign spies, criminals, domestic spies, and even wilder theories like the cryptids.
There is a feeling of uncertainty in the air, people looking at others with distrust and fear of what the other might be and blaming them for all that is wrong in society. Everyone agrees however that society is not well and needs fixing.
Harry has haunting dreams about the world around. War between the Moralintern and one of its largest geopolitical rivals (field of wanton atrocities), the Pale expanding and slowly reaching already inhabited land, the rise of addictions to stuff even electrochemistry has no interest in and dodges from trying, nothing having changed for the better on a larger scale ever since solving the mystery of the Hanged Man's murder five years ago and there being no indication anything will, while the end of the world seemed to be approaching.
The turning point of the story is when the affected factory complex shuts down its production complex from running at a loss due to the sabotage and the workers protest the loss of their jobs, which Harry and Kim get to observe. An admirer of the Dockworker's Union in Martinaise throws a rock at the police and due to the already high tensions, the cops march in and disperse the protest violently, even killing someone in the process (off screen?). Anger is high, the decisive moment seems to have come and Harry is convinced the world as we knew it was about to change.
The crowd disperses, tension remains high and the next day... nothing happens. The worker protests grew smaller and are not even marching anymore, just standing around a soapbox and giving a speech to a few dozen people. Harry is confused by all this and has the option to either try to incite the crowd by throwing the first stone or listening to a boring speech and going home to sleep. Should he try it, he gets arrested (and Kim might try to prevent that if the trust is high enough) and collapses.
He wakes up in an empty Martinaise during the followed ideology's idealized society and walks around it - a comrade would see a stylized version of the Commune, a fascist the Kingdom with everything being appropriately medieval and kinda shitty, a lib the district as it was during Disco Elysium except with the church fully repaired, the harbor docks opened (both inaccessible) and the traffic jam gone, while an ultraliberal would see the same but the statue at the roundabout replaced by one of Harry and he'd be wearing a tacky expensive suit and regain consciousness on a boat similar to Joyce's.
The finale would briefly switch perspective to Harry Kim leaving the hospital Harry was unconscious at, alone (leaving his fate to interpretation) and driving off while the radio news was implying that in spite of the perceived failure, the situation really was still heating up and various kinds of workers were advocating for change, a new society. That no matter if Harry was actively supportive or against a positive societal change, nothing was set in stone and history still continued, moved by the desire for a better life.
...yeah, I'm not much of a writer, certainly not good in bringing themes across in a good way and definitely not as beautifully as the team behind Disco Elysium did.
