Doubtful. Where would the additional Republican votes come from? If any region, Republicans have only gained in the Midwest in recent years, which is losing population in the long run. And it remains to be seen whether that's still the case post-Trump. Otherwise, Democrats are very strong in California and New York, while population centers like Texas and Georgia are trending away from Republicans.
While the Electoral College favors Republicans, they have a lower ceiling. It's almost impossible for a Republican to get past 325 or 330 electoral votes in a head-to-head matchup, while Democrats can reach 350 and beyond.
I've heard Democrats are maxed out there [CA], is this true? Also, isn't NY a little more elastic than CA? This also assumes these trends stay exactly the way they are now and never change. I personally think it's wise to never assume a state will ever stay with one party forever and no state is absolute from a new critical mass of ideology.