For comparison's sake, Hitler killed 13.6 million people. History is very likely to end up remembering Trump as the single deadliest regime in history.
My conspiracy theory is it was chosen to deliberately harm the optics of environmentalists. Something with minimal useful impact and maximum inconvenience would turn people against the whole idea of environmentally friendly alternatives.
I'm sure if they take power, their first order of business would be to legalize all Nazi symbolism and drop the "we're just run of the mill conservatives" facade entirely.
A lot of Trump voters are horribly uninformed. They didn't know - and still don't know - what Project 2025 is. They thought it was fearmongering because they only heard about it from Dems. They have no idea what's happening right now, nor do they care. All they know is their team won, and they're otherwise tuned out. Maybe they'll wake up when they feel the effects, but they'll probably just blame Democrats because Fox News tells them to.
The set of all possible universes does not include impossible universes. If you assume all possible universes exist, you've already eliminated universes that are the only universe as impossible.
Legally, not without a constitutional amendment. But if he just declares he's running anyway, the Constitution is as likely to stop him as any other piece of paper.
15 year generations don't really make sense though, the whole concept of a generation is that they're the previous generation's kids.