I mean I’m sure plenty of Texans have no desire to succeed. But there are multiple real actions that suggest the state has it in mind: separate border enforcement forces, isolated power grid, the Texas rangers/trooper or whatever they’re called. It may all just be maneuvering/bluster, but when you see the state power structures trying to create Amon Bundy-standoffs it does make one wonder.
There also nascent secession movements elsewhere, California has a visible one.