I’m sure they’ll come up with other reasons, but the kind of fundamental economic change he is trying to bring about takes a lot longer than 4 years. I think this will be one of their major selling points for Trump 2028.
If he lives that long, that is.
I’ve been fixated on the GOP justices simply ruling he can run for a third term. But your scenario is also plausible. As a bonus - it’s really funny. I can imagine dem pols 10,000s of times saying “He cannot do this!” But they don’t actually do a thing to stop him.