So let me start by saying that I think SCOTUS is for the most part a group of a few decent thinkers and a slew of partisan hacks. Not going to argue otherwise. However, I actually think that they had to take the immunity case. They didn't get to test the BS about "If the president does it, it's not illegal" back in the 70s because of the Nixon pardon. They haven't had an occasion to do so since, so even though the lower courts basically laughed Trump out of court, I still think in the long run it's incumbent on Roberts to lay the smack down for any future presidents who claim to be above the law. Which is silly, I know, because the facile imagination one needs to possess to show how ridiculous that claim is basically makes it self-evident to anyone who isn't comatose (looking at you Justice Thomas). But still. Two president-crooks have tried to make the claim, so it needs to be addressed.

As for leaving office in 2029, I think it's a misreading of the tea leaves. First of all, the president doesn't get to decide whether to leave office. More or less, the military does (which hopefully it will never come to that). But all the military officers I know (not tons but a few) are not in favor of dictatorship. Seems to be part of the coursework at Westpoint or something. But beyond that, Trump is going to pardon himself on day 1, and there's no way that works itself through the courts until after his term ends, and then we're talking probably another two years. So 2031 best care scenario? He'll be 85. Nobody is sending an 85 yo to jail, let alone an 85 yo former president. Hell, he'll probably have clogged his arteries so badly by that point that he'll be fortunate to not be full tits-up. So while I don't look forward to 4 more years of nonsense, I also think that the story will write its own end in a way.