Well, for one thing the world is fucked no matter what you do. I just want to be absolutely clear on that one, fire rises, ect.
But don't forget: Obama, Biden, and HRC created Donald Trump. His presidency and his politics were forged in their crucible. Some explicitly, like the Pied Piper strategy. Some implicitly, the impacts of the entire Obama administration's failure to function. And Biden at the helm has this problem far more intensely than Obama or HRC. They could play at dealing a card or two even if they'd never actually do it, but Mr. "Nothing Will Fundamentally Change"? Yikes.
So the consequence of electing Biden is that he'll likely accomplish one moderate-significant bill unless Mitch is stiff-necked enough to not even do that much, then piss on that bill regardless, replace Ginsberg with a conservative who he's friends with, and then in 2024 the Republicans win an even larger majority with an even more fascist candidate (again, Mr. Cotton) and more angry insanity while the Dems have presumably ratfucked AOC or whoever gets the left candidacy in favor of some other ghoul if not Biden himself. Thus is the shape of the death spiral, where the Republicans continue to gain advantage in a combination of cheating and being willing to do anything at all while the Dems warm seats. What the GOP likes to do is insane and futile of course, and they like it even less when the Dems actually join in with them, but people will generally prefer the stronger and louder voice which the GOP will always have over neoliberal Dems.
This of course is most likely going to be irrelevant since Trump will probably be reelected regardless of the vaunted AmeriPol Thread influence on the election, but for the posterity of humanity's tomb I'd like the lack of foresight in even trying to elect Biden to be on record.