Conservatives really hate Democrats, much more than they hate RINOs. I'm sure they'll primary many RINOs, like they did during the Tea Party days. Republicans are much better at showing up in midterms also. There wasn't a blue wave in 2018 (even with cheating going on then), and there certainly wasn't one this year.
The Democrats have nothing of substance to offer anyone. All they do is take and destroy. Even if many people don't vote with Trump gone, the Democrat Party isn't winning anyone else over with their awful governing.