Georgia will flip. Metro Atlanta is on it's way to being like Northern Virginia and will make up an even larger portion of the statewide electorate.
It's not moving as fast to the Democrats as Northern Virginia has.
There are substantial numbers of conservatives moving to the suburban/exurban areas as well. And the gerrymandering implemented by the Republicans in the last two decades will take quite a while to unwind.
Still, the future is bright for the Democrats in Georgia. I think 2020 continues to be a little early for the flip, but it's worth a significant play. Two Senate seats, winning GA-07, holding GA-06 (Lucy McBath), and picking up several state legislature seats are on the line.