It will get more Democratic.
The reason Texas is firmly in Republican hand is that Hispanics have very very low turnout in Texas.
Democrats (at least in Texas) have foolishly waited, believing that demographic changes will put them back in power.
Now the Democrats have launched a full-time organization with the goal of turning Texas into a battleground state by doing voter registration drive.
Here is how it will happen. In 2018, the underdog Democratic nominee running for statewide office put up a really strong fight. He ultimately lost, but only by ~2%.
The Democratic base is energized and finally push Democrats to win statewide. Meanwhile, the presidential campaign caught political wind of change and Texas becomes prime battleground state.
This is probably what will happen, but probably not until the 2020s. TX Hispanic are both more Republican and less likely to vote than Hispanics elsewhere. The only way it will happen earlier is if the Republicans have a particularly brutal primary for a statewide office in 2014, 2016, or 2018, leaving them with an extreme, unpopular nominee with a bunch of far right positions who then Akins himself, leading to a Democratic victory. The other possibility is that Ted Cruz runs for reelection in 2018 and loses (he's basically what Glenn Beck would be if he were a U.S. Senator, so I wouldn't completely rule it out), though more likely Cruz's defeat in 2024 will be the moment that signifies Texas's transition from a deep red state to a purple state.