One of the things that worried me as well. The odds of Democrats holding the White House for 4 consecutive terms were astronomical. 2020 is going to be a FAR more important election: there will likely be more SCOTUS vacancies in that 4 years than in the next 4, and 2020 is a census year, which means reworking congressional districts.
At least this way, the public is liable to be pushing the pendulum as far away from the GOP as possible, and if we catch that wave right, we can do some real good.