I believe that due to the inherent contradictions of capitalism a revolution is inevitable, and necessary, but it's still not something that is easily palatable. Revolution is certainly romanticized, yet I still question every day whether or not I would be willing to die for my beliefs. My question to my fellow comrades is do you think non-violent form of revolution is possible, or will the state and reactionaries always crack down? I know that in the past those with power and prestige have been reluctant to give it up.
That's the thing about propaganda -- you don't have to engage seriously with it for it to be effective. Do you think the Fox News cranks are seriously engaging with that content now? They're just taking it at face value, or passively soaking it up as it plays in the background.
Plus, a great deal of propaganda in this country is subtle enough that most people would disagree if you even called it propaganda (think of shows like COPS, or even local news reports on crime that just reprint police press releases). Re-programming that stuff is just as important, and if someone flips it on or casually reads it in a newspaper it'd be harder to dismiss as "commie propaganda." You're right that there will be some people you just can't reach, but we should absolutely try to minimize the amount of state violence needed to stop them from sabotaging society.
It's only subtle because it is presumed to be eternal and by default. It is only subtle because it is everywhere and has been everywhere for the lifetime of everyone currently in existence. I'm sure liberals thought differently at the dawn of liberalism, had different opinions based on their lived experiences with previous systems. But capitalism has been around so long and so strongly sewn its own narrative and the narrative for its enemies like socialism that even old people telling stories are just telling stories about slight differences in the same system.
By contrast communist, anti-imperialist, anti-nationalist, anti-American propaganda would be INCREDIBLY jarring to people who have spent lifetimes not noticing or assuming as normal the things you're railing against.
So quite frankly you don't understand. For younger people growing up after the revolution it would be easier but they'd still have older people selling tales and lies about how things were different or better under capitalism. To get to the point we are now with capitalist propaganda not even being noticeable would require the first generation who grows up under socialism to have kids and die themselves and possible for those kids to also grow up and die to sever the memories and propaganda of the old.
It'd be different, but that doesn't mean jarring. If you do a quasi-documentary in the style of COPS but focused on the worst parts of our legal system, the format will be familiar enough even if the content is focused on how fucked up things are, not on watching pigs crack skulls. You can already find stuff like this, and it's even easier to find purely fictional media in this vein. No one is screaming "commie propaganda" at The Shawshank Redemption. It can be done, and it has been done -- the only question is how far you can go with it.
Neither of us has a crystal ball here.