Keep an eye on his rhetoric. He'll talk in broad strokes, bright-shining-future abstracts... But he never talks about anything specific. Never about how any specific policy will create a specific good outcome. No concrete ideation.

An idea that has been floated on this topic is that he's not actually capable of imagining such a future because he won't be in it (one way or the other; dude's 78).

It makes him dangerous. He can accidentally destroy something he can't even conceive of existing.