Regarding Texas (getting way off topic here, but who cares), it will not flip blue in 2020. Won't happen. If Dems put resources into flipping Texas, they are making a grave mistake, just as they did with Georgia in 2016.

Texas will flip blue eventually, I agree. And then Republicans are in trouble regarding Presidential elections, as this spots Dems another 76 electoral votes (-38 for R, +38 for D). But that's definitely not happening in 2020, and it might not occur until 2028 or 2032. 2024 is a possibility, but I wouldn't bet on it.