Well, most people believe it gradually is, including lots of Republicans, because of "demographics" helped by George Soros's state-flipping project that rolled Colorado to a blue state six years ago.
It involves basically getting control of the secretary of state's position and then getting illegals to the polls with phony credentials, "helped" and egged on by ACORN types (whatever they call themselves these days, they're still the same old vote-fraud mills).
Let me clarify what I meant when I said I don’t believe Texas is turning blue. What I meant was I don’t believe it will ever go blue, though I am aware of the forces you mentioned that are bluing it slowly. I also meant that there will be a tide of very red voting folks moving in as well.