The GOP has a majority in the House and the Senate, as well as the Presidency and an obviously biased Supreme Court.

This midterm its basically assumed that the dems will take the House, and it's plausible they will take the Senate. Unfortunately, it's impossible that Dems gain enough for a veto-proof majority, so not much can actually be done from passing legislation.

I'd add some caveats that there is a political benefit to passing popular legislation and letting a Republican president shoot it down, and it's possible (though unlikely, imo) that Trump gets so incredibly unpopular that members of the GOP cross party lines to give some legislation a veto-proof majority. I consider it unlikely because if they haven't done it yet, it seems unlikely they ever will.