Imagine spending years playing San Andreas. GTA IV hasn't been announced. Your mind races with the possibilities of a new game. You imagine they're going to do a whole country instead of a few cities. You think of all the mini games, all the weapons, and customization. It is the first "next gen" GTA after all.
Then you have been playing IV for years. GTA V hasn't been announced. Once again your mind races with possibilities. There is no end to the amount of detail it will have, there is nothing you can't do, there is no limit to the map.
Now you've been playing V for years. Here we go again. But there really isn't anything to imagine. You know it's going to be just a bigger map. At least until it gets close to release, where the devs admit the map is the same size as V. They claim it's okay because there's more things to do. But all that means is more things to collect, more so-so mini games.
You've played RDR2 so you know how much detail it could have. You know they'll simulate everything. So there can't be any real surprises. You'll see more wildlife. Your car windows will fog up. Your character will swat mosquitos.
You know the graphics can be just a little better, not like moving from PS2 to PS3. More reflections, slightly better lighting, a little more detail in the textures.
Now you realize you're on the plateau. There are no more great heights to surmount.There is only lateral movement from here on out. GTA VI can only be as good as V, with marginal gains in every category, but not exceptional gains in any. You'll drive from Point A to B. You'll shoot the gangs. You'll escort the cars. Everything you have already done.
There is a running theme in culture right now and it's that large, long-standing franchises are starting to eat shit. They can no longer push the needle. GTA will join them.
What got me about GTA 5 is that there's fuck all to do after you finish the game. For a game lauded for being an open world sandbox, all there is to do is drive around, shoot people and customise cars until you get bored. You can't pull off any interesting crimes or heists at all outside of the story
GTA V is boring af. The story is not even that great. They only fun part is to play with friends or with mods.