For example, Republican Jerome Powell is no Pinko, but under his watch the fed has become less closed minded about that "full employment" should look like. This is good, and is precisely because that and the pandemic checks that we are seeing great bottom half wage gains (in real terms too) and increased strikes.
So yes, ultimately you can't trick "the man" with new ivory tower shit, but you can at least attack the straw mans and deflections. Maybe the best theory of change is to create new pandemics so they will have to print more checks to defend the system, and eventually, one of those strike waves will be the revolution :D. (Is this conservationism? I don't think so, because it's about the system's response to a bad thing making "working class lives" better not worse.)