He'll probably just run again in 2024 — unless they ban him from running for re-election, which could happen if enough Republicans defect. He'd probably win the primaries, but if he doesn't: I wouldn't discount a third party run. Perhaps Constitution or Reform; fun fact: his first campaign was Reform. He could very well just run Independent or make his own party, though.

Biden won't last four years — this man couldn't even run a proper campaign. If he survives, and somehow doesn't get twenty-fifth'd, he won't be in the mental state to properly lead the country, and Kamala Harris will be the de-facto President. He'll just become a rubber stamp.

Kamala Harris will probably be the Democratic nominee in 2024, with fierce opposition from AOC. I don't think they'll try to run Biden's corpse if he's still around, but they might. Doesn't really matter, though, since Harris would still hold the real power. The Democrats will win the Presidential election in 2024, I'm fairly certain about that.

The Democrats control the Senate, but they won't get much done, because the party is split between hardcore leftists like AOC and moderates like Biden. I predict some fierce in-fighting over the next four years. The Republican party will have its fair share of in-fighting as well.

The economy will continue to get worse, even when Covid subsides, since the damage has already been done. This will give the populist factions a major boost, but I don't think they'll overcome the elitists anytime soon.