Various observers have described the all-out attacks on the Trump administration as a "coup" or a "coup d'etat" or a "civil war." A bit of hyperbole? Perhaps, but serious obstructionism is certainly the intent.
The Democrats' strategy, to the extent it has moved beyond the tantrum stage, appears to be to create so much chaos that enough Republicans will join them in an impeachment effort. Maybe I'd phrase it thusly: "If we can't have the government we want, we will have no government at all ... gridlock. It's our guess we can tolerate chaos better than you can, and you'll give in to get some peace."
If it turns out they're correct, the GOP is effectively dead.
McConnell, Ryan, et al. need to hang tough and do some legislating. If majorities are worth anything, they'll make 'em function to move an economic growth agenda. If they have to dump the filibuster, it should happen, go "full parliamentary."
This is war, undeclared but very real. And while they're at it, they need to reduce the protections federal career employees now have which enable them to mount a full-on obstruction.