Secession is a nice dream, but also a fantasy. If you thought the Feds were not amused in 1861, can you imagine their reaction now? Texas is one of the bright spots in the whole US economy — the Feds won’t let that go. You see, once Communists take over a country, they don’t let go until you pry loose their stiff dead fingers with a crowbar.
Americans no longer have the stomach to murder millions of their own countrymen over a matter of political realignment.
If one or more states decided to walk away from the union, there'd be a whole lot of racket and maybe even some implied threats from Washington, but it would stop short of actually sending troops in to quell an alleged 'rebellion'.
This is a far different age with a very different people than what existed in the mid nineteenth century. Recent administrations have a hard time getting support from the American people to conduct military operations against known enemies, let alone against their own people over a purely political matter.