DC metro has over 6M people. Virginia seems to be popular with immigrants. I think DC is viable. But its cost of living is higher than Texas.
Bezos has a house in DC. He can do his lobbying without HQ2 in DC.
DC is pretty polarized in terms of income. Political people are super rich, but 1/3 of population in poverty and commit tons of violent crime. It could be a good gentrification play, but the crime is a big risk