Texas Hispanics are more conservative by a mile than Hispanics in other states, but obviously Texas is shifting left - just not as fast as a lot on this website like to believe.
Idk man, it shifted 6 points to the left from just 2016 to 2018 alone lol. It wasn't just Beto - downballot dems only did about 1-2 points (and some, like MJ Hegar, outperformed Beto).
This was with relatively low hispanic turnout too. 2020 will likely have higher hispanic and youth turnout too which will help dems.
I imagine Cornyn should have a healthy lead on MJ Hegar for a while because she has really low name recognition, but I think in the last month or so she might start leading Cornyn in the polling averages.