Georgia would certainly not be a one-off, Trump would have just acted as a catalyst in the process of it turning into the new VA. It would also mean NC is slipping away from Republicans very fast. South Carolina will most likely return to the GOP, and it will take many more cycles for it to be a true swing state.
It would mean Republicans are in deep sh*t at the presidential level.
Let's say this is the battleground map in 2020, assuming Hillary/Kaine is going in with Obama 2012-like approval ratings:
248 D175 R115 T
I think this is being friendly to the Republicans by making PA, MI, and WI tossup states.
Anyways this is still bad terrain for them. They basically have to run the table in the Rust Belt (win a state they haven't won in 32 years) AND win Florida. Doable, but leaves them basically no room for error.
