There are several congresspeople that I think would be ample (or even arguably superior) replacements for Pelosi: Cedric Richmond and Ben Ray Lujan would be strong options, for instance. But Tim Ryan is sure as hell not one of those congresspeople, and it's tragic to see so many progressives ally themselves with Ryan (who is ultimately more conservative than Pelosi) just because of their anti-establishment vendettas.
At the end of the day, though, I do think that the next two years will require a Democratic leader who is deeply experienced, and obviously no one fits that bill better than Pelosi. I guess I don't see why everyone is so certain that she will spinelessly settle for excessive compromise with Republicans.
Progressives have been promoting Barbara Lee.