I think the recent Tennessee election shows that even though things have soured, they haven't soured enough for sweeping changes in elections. Special elections are strange litmus tests to be basing anything on. Regardless of what polls may lead you to believe, there are still plenty of people that will not vote for the other party regardless of how "bad" their party's candidate is.

To regain control of both houses with enough margins to ensure impeachment & conviction would be an incredible swing. I just don't see it happening.

Texas just got its redrawn maps approved by SCOTUS. I'm still expecting SCOTUS to reject California's though when that case comes to them. The court will do its part in keeping the GOP in power.