I don't think many Texans want to secede. I think a lot of them DO consider it an option, though, if things get "bad enough."
Which, IMO, is an important check on the power of the federal government. I LIKE the idea that states have enough autonomous power to make secession a viable reality if/when the federal government gets out of control. Do I think that Texas (or any other state) has a good case for secession right now? Heck no. Could that possibly change someday? Heck yes.
And if the federal government really does ever degenerate to the point where it entirely ceases to protect its people, then states SHOULD secede if they value their freedom.