I think that the real answer is that different things work for different people.
Personally when I make changes in my life I always go 100% straight away. I have a really hard time with half measures. Like when i wanted to lose 5 kg I started logging everything i ate and just was super strict with ny kcal intake for a year to not gain it back, no cheat days. And when i went vegan a few years later i did that cold turkey.
Exceedingly unlikely given the fact that he's already that old and also that he only has one term left. He would have to be really industrious to turn america into shit(tier?) in that limited time.
But I don't disagree that he'll give it a go.