In this scenario, this GOP domination would go beyond the WH and Congress. There would be another Scalia type appointed to SCOTUS, again giving the court a conservative majority. Also, at the state level, most governors are and will be GOP, and the state legislatures are/will be overwhelmingly GOP. And then there's the 2018 midterms, which typically feature conservative turnout and this particular midterm will feature a bad map for Dems. Though this could be neutralized by liberal/moderate backlash against the Trumpublicans.
Overall, a complete Democratic dystopia.
The legislator advantage in the states for the GOP is often overlooked, despite bring pronounced. I remember some prognosticators mentioning that this was where dems were really hit the hardest in 2014.
GOP controlled legislators: 31 (23 with GOV control)
Dem controlled legislators: 11 (7 with GOV control)
Split: 8