Yeah I’m not arguing that, you’re right. I just don’t think they’re effectively using their leverage.
That said, their hands are tied for now, because if any of them said anything at all about Biden stepping down before it actually happens, the entire narrative would shift to “progressives undermine Dem chances, it’s all their fault.” Establishment dems are so eager to learn the wrong lessons in these situations…conveniently allowing them to never have to evolve their politics.