Nate Cohn wouldn't bet on Texas turning blue:
If the two parties continue forward along the lines carved by the Bush and Obama years, then Texas would become quite competitive by the end of the next decade and Democrats will routinely approach 400 electoral votes in national elections. But between now and the mid-2020s, the Republican party will make adjustments to compensate for changing demographics and new issues will rejigger the electorate along unforseen lines. After Bill Clinton won West Virginia by 15 points and lost its eastern neighbor by 2, I suspect that few analysts in 1996 forseaw West Virginia becoming the fifth-most Republican state or Virginia voting more Democratic than the country. The ascent of Democrats in Texas is hardly inevitable and even if it is, it won't be in 2016 or 2020, at least not in a close election.