I mean, they are occupying a section of the border of the entire country, and denying, through threat of violence, the federal government/military access to said border. At some point, this simply has to be read as insurrection, and put down. A country only gets to exist and enforce laws by virtue of the implied violence (physical or otherwise) that it can leverage to back it up.
Of course there are complications to this, like the thought that steamrolling these troopers would then spark a greater revolt. But when you have a state doing things like this, particularly a state that has made it abundantly clear they desire to secede and have prepared for secession, I think you need to play hardball. This could be either by forcibly bringing them back in line through state violence, or giving them what they want, in such a way that it ends up being a pyrrhic victory; imagine aggressive border protocols and removal of free travel along the Texas border, intense tariffs and duties on Texan goods, etc… honestly a Texit could be quite beneficial for the country, shifting congress balances somewhat. Add in some statehood’s for PR, Guam and DC and now you’re really cooking with gas.
Who knows though, I’m still finding it hard to believe that the Jan 6 insurrectionists weren’t mowed down in machine gun fire when they penetrated the capitol, so clearly my expectations of government reaction and what actually happens have some daylight between them.