If Trump runs, he will win the primaries. He has the GOP even out of office sucking his dick. Nobody put him in his place the first primary. Trump knows how to do the WWE Jerry springer act. Having said that, no matter what swing voters think of Biden currently, I think enough of them had buyer's remorse the first time they voted for the orange turd. Remember there were swing voters who voted for Obama then the former guy.
I think what should scare sane people is that outside the Presidency there is a collective effort by the GOP to take away the rights of voters at all levels.