Trump doesn't care about anything but himself, of course.

But the judges he appoints do. And if his first term is repeated, he'll again just appoint the far-right judges that republicans hand to him.

You're right, some things will be left up to states and I think we'll see more state divisions and self-sorting of people among states.

On abortion, it will be interesting to watch republicans fight over trying to push a nationwide ban. Trump is savvy and powerful enough to squash that, probably.