I can't find Biden's position on it, but the Obama administration he served in supported RCV. Democrats generally support RCV, Republicans explicitly oppose it. Many red states have outright banned it.
It won't happen. Here in Canada where we have a healthier multi-party system, electoral reform was a Liberal party platform right up until they got elected, where it swiftly died. There's no way the Democrats don't do the same.
Voters don't seem to care enough. While not nearly as easy in the US, Canadians could have voted the NDP in instead of the Liberals. But nope, most Canadians are very apathetic about politics, including electoral reform.
I loathe that Trudeau backpedaled on it. But the fact he faced no consequences (as in, got reelected) makes it clear that he was right. Not that many people care about it. Which is a dumb ass reason to backpedal, though, cause that's the case for most policies.
I'm a fan of Bucklin voting in particular, allowing equal and skipped rankings along a bounded range of 0 to twice the number of candidates, every candidate default of 0. Give people an offline digital interface to do the work, they confirm it, print it, check it and it gets scanned to be counted. Undecided if I think votes should be weighted by rank or not, maybe just for tiebreaker.