I think you missed the turn. The Republican party has rebranded itself so much so that many of its historical upper class elitist members have defected to the Democrats, where they still respect a guy with lots of wealth like Bloomberg.

In contrast, a large number of Republicans are blue collar working class people who left the Democratic party because it no longer worked for them. Joining them this election have been working class African Americans and Hispanics. Expect Trump to win a larger share of the African American and Hispanic voters than other Republicans in recent years.

More and more Republican candidates for downstream posts come from working class minority roots. If Biden passes the promised taxes and other spending bills he has in his position paper, the Republican share of the middle class will expand even more dramatically.

The "Bourbon" Democrats will be trying to manage their disparate "identity groups". The wealthy poured a lot into the Democrats this go around and they will expect the Democrats to return to globalism so they can move their money and business where it is taxed least even as they pretend to support higher taxes. As long as government can keep spending the future income of workers in the form of deficit spending... things will be calm... but how long will that last?

The new Republican party will be led by people like Nikki Haley, a woman of Indian descent and conservative values. Of all the names you listed only Marco Rubio is likely to be a player in the new Republican party, the son of Cuban immigrants... the others individuals on your list are largely historical figures whose time has passed.

But Biden is an empty suit who lacks any leadership skills. And unlike Obama who was skilled at managing conflict within his party, Biden lacks those skills. It is the Democratic party that is headed for the "Big Divide". The differences between historical moderate classical liberals and the new coastal progressive liberals won't have the "common enemy" to keep them together... for the last few years, the refrain has been we have to stick together to beat Trump... but what will the unifying cry become if the Democrats win... it is far easier to be against something, then to be for something...