the map has been tilted this way since the democrats peeled off virginia & colorado. even this election was closer than it needed to be, because the candidate was weaker than he should have been. but, all the democrats need to do is run somebody halfways respectable and they will win for the foreseeable future. if arizona eventually swings, that just cements the map - even if georgia flips back.
trump shouldn't have had a chance in 2016 and only did due to how horrible the democratic candidate was, and he didn't have a chance this year, either.
the republicans need some kind of serious way to smash the map open or they're going to need to get used to losing, and it's not at all clear how they're going to do it.