I don't really understand where you guys are getting the idea that it's such a sure thing that Biden is going to do this if he wins the election. I mean, he might do it but it would be a fairly major change in from how the Dems normally do things, and Biden is an extremely conventional D candidate.
How many nakedly corrupt, Bullshit Republican Things have there been this term which have had no more consequences than Lindsey Graham getting owned on Twitter? Six, seven hundred? Why is this the one that's going to push the Dems over the edge?
He won't have much of a choice after a particularly egregious abortion decision. Or even in response to Obamacare being struck down, which might happen this year.