You forgot the part where Uncle Sam would have to borrow trillions to finance said war. You also forgot to mention the fact that the American public has either lost their stomach for the type of real war that would be necessary for the U.S. to ensure a quick victory or that modern technology has simply allowed less of an escape from the hellishness. I'm not saying that Texas could win such a hypothetical war, but they just may be able to pull it off. After all, they don't need to "win" per se, but only need to hold off until America loses its will to fight. If they were going to do something like secede (which they aren't) now would be the perfect time. They'd start off with a better credit rating, more valuable currency, and an economy with a sounder foundation than their foe. They'd also do it at a time when their adversary's military was already stretched dangerously thin around the world.
Given, the whole discussion is a tin foil hat fantasy, but I wouldn't automatically assume that the U.S. would be smashingly successful if a conflict were to ensue. Heck, the writers of the linked article may just be on to something by saying that the rest of the U.S. may simply shrug their shoulders at the departure of a conservative state.
