I expect the accords to stay long after Endgame. Even if Tony apologizes to the rest of the team and has a change of heart, he’ll probably die fighting Thanos before he changes anything about it. Peter will never sign up for them, which might result in civilians viewing him as a menace and allow J. Jonah Jameson to be introduced. Plus, since the X-Men are coming to the mcu, it would create some interesting conflict. If they live past A4, what might happen to Steve, Thor, Bruce, Natasha, etc.?
I think it could be interesting, but I have to disagree, for a few reasons.
First, superhero movies as we know it can’t exist alongside the accords. Every movie would become a political dissection of human rights vs. doing what the UN tells them do vs doing the right thing. There’s only so much you can do before general audiences will get tired of the same conflict over and over again, even if you have variations in how they occur.
Second, I think the world after Endgame will be dramatically changed, one way or another. If the world remembers everything that happened, I think they will adopt a “bigger picture” outlook, which is supported by comments that the next phase have a lot more space, and a lot less earth problems. I can’t see anyone supporting a politician that says “yeah half the population died and these people saved it but how about we threaten to take away their human rights, again?”
If the world doesn’t remember it, all the writers have to do is drop them back pre-accords and wipe the slate clean, for the first reason I mentioned. Or maybe they’ll use that to create a version of the accords that’s more amendable.
Now, that doesn’t mean that possibilities you mentioned wouldn’t be interesting to explore, I just don’t think Feige wants to pigeonhole the MCU into one very focused conflict. The thing that has made the MCU so successful is how they tackle very different conflicts in different sub genres with different moods. It was good to see how the accords were affecting Hank and Hope in Ant-Man and The Wasp, but for general audiences...I just don’t think there’d be enough interest in that to sustain it long term. And I think it’d get really depressing, tbh.
We also know that Phase 4 is supposed to be taking us away from Earth, and into more galactic territories. But that could go either way - maybe because they won’t be focusing on earth they can keep the accords around with minimal interference, or maybe they’ll just undo it since it’s unimportant to their new plans.
That said, neither of us know what’s going to happen. You could be right on the money and I could be way off base. These are just my opinions, and I can totally see why you came to the conclusion that you did. Maybe this is just wishful thinking, cause I kinda lost faith in how the MCU has dealt with this issue.