The Democrats are much, much more optimistic than I am. I think if the Pubs win again they will become comfortable and lethargic. If the Pubs win, they won't do a damn thing, except further institutionalize the status quo, and set up more kick-back deals.
However, having said that, at least they will leave Trump alone. The Republican Congress is a lost cause. Trump, on the other hand, is Trump. He is a man with a mission. So saying that a Republican Congress is and will continue to be a do-nothing Congress is accurate, but in this case that may a good thing. As long as Congress stays out of Trump's way, the progress we have already seen in the last two years will continue unabated.