I think it would be fine to let Texas secede from the United States. If they want to go, fine. Just as long as they pay their share of the National Debt before they go, let 'em.
It's not that I dislike Texans in any way. Every one I've ever met has been great. I just think it would be kinda fun watching Republicans try to retake the House, Senate or White House without Texas votes. The last Texan to occupy the Oval Office made that difficult. Texas leaving the union would make it darn near impossible.
And while we're at it, could we please do something to piss off Florida?