I certainly don't think that, say, losing the House will usher in a glorious period of bipartisan cooperation whereby exciting progressive legislation gets passed with some Republican support, though it is probably true in some sense that it would lead to something other than Republicans trying to torpedo absolutely anything. They'd have some power to set the agenda and therefore take credit for things unlike now where they aren't in charge, don't get credit, and therefore have a rational interest in just opposing everything.
On the other hand, I don't especially care if Republicans start voting yes on things they support and then maybe agreeing to some compromise. I don't think we'll get better results that way, and certainly don't care about bipartisanship as an end in itself.
