Under a section titled "State Sovereignty," the Texas Republican Party platform states: 

"Pursuant to Article 1, Section 1, of the Texas Constitution, the federal government has impaired our right of local self-government. Therefore, federally mandated legislation that infringes upon the 10th Amendment rights of Texas should be ignored, opposed, refused, and nullified. Texas retains the right to secede from the United States, and the Texas Legislature should be called upon to pass a referendum consistent thereto."

As far as Texas seceding from the Union; aside from it having the magical ability to just do it being a myth, I wish they would. Allow them to become an independent nation. Have the federal government immediately cut of access to any roads, airways, pipelines, the electric grid (not all of Texas is covered by ERCOT), and anything else that connects Texas from the rest of the country. Put a small portion of the Navy off their coast to blockade them. Have the military retrieve all Texas National Guard equipment provided by the federal government. Cut them off from the international banking system. Lay heavy sanctions on the state and it's leaders since succession is equivalent to treason. Then let them rot for a few years before allowing them back in...... I'm kidding (kind of) but I really wish Texans would shut up about their fictional right to secede at any time.

Just to put salt in the wound, lets kick all Texas' sports teams - college AND pro - out of their respective leagues if they manage to secede. And require Texans to have a passport to enter or exit the U.S. (No U.S./Texas dual citizenships allowed!)

They decide they want back in as a state? Then the price should be that every politician who voted to secede is forced to resign and Texas has no one at all in Congress until the next session.

There's an excellent Op-Ed in WaPo today wherein it lays out the stupidity of voting out elected officials based solely on things they can not control (gas prices, produce and meat shortages, etc).  It's behind a paywall, but if you subscribe (like me) but haven't yet read it, it's here.  While you know where the Dems stand and can judge them on that, the Republicans haven't offered an official party platform in over three years.  THREE YEARS.  Even steadfastly refused to put one out during a presidential election. Just counted on "America First" and "Make America Great Again" to carry the load. Jesus. Minus that, you know what their platform is:  regulating a woman's body, burning books, controlling curriculum, telling kids that they can't get needed help during a time where they're just beginning to understand their own bodies, telling out LGBTQ kids that they are unable to participate in sports according to the gender that they feel that they are, cutting taxes on the 1% while holding down wages for the middle and lower class, demonizing immigrants (mostly those who are brown and black), calling COVID "the Chinese Virus" for several years thus escalating anti-Asian hate, and that all elections are stolen/rigged/cheated unless they win.  THAT'S the Republican platform. That is, apparently, what will once again "Make America Great".  It's a national platform that they refuse to formally promote as a party but one that they've steadfastly endorsed in various forms since at least 2016 and one that has surely been propped up by this bullshit resolution written by the Texas GOP. See how I tied it altogether?  

So, sure.  Vote out a Dem who can't control gas prices and vote in a Republican who supports all of that.  Awesome.  Good ill-informed job!

Yeah, their per-capita GDP is almost $2000/yr lower than the US average, so they're dragging the average down.  Going solo would be really bad for them. Might be compounded by all that cheap labor wandering across the border might be less inclined to go to another poor country.

I expect US arms an defense contractors would also be required to leave pending trade treaties with a foreign country.

I suppose they could do like Costa Rica and spend most of their money on education, etc. instead of building a military. <-ha!

Losing the Texas electoral votes would also make it really hard for the GOP to win a Presidential election, like ever.