For your first point obviously there is going to be a struggle between these new types and the older groups; I think Joe could pull of an Obama 2.0 but to be perfectly honest I can't say exactly how it will go yet, maybe in a year I'll feel more confident in saying which "side" (I know I am simplifying it here) has the clear edge.
As for your second point I am not sure they ever really recovered from Reagan: They used his VP for only a single term, he got Perot'd, then after 8 years they used the son of the guy who got owned who was once Regan's VP for only 8 more years where he mostly just dicked around in the middle east. And then right when things would have completely imploded for them Trump comes in, does honestly the exact same thing Reagan did, except this time there is not even a second term with a coronated VP to hold up to continue the grift.
--So I have serious trouble seeing where they go from here: I guess I could see them try to move closer to the modern center, but to be perfectly honest Biden already is doing that niche and I think in the long term no one is going to have further enthusiasm for republican's economic policies of free markets and corporate welfare.