Texas didn't ban direct sales of Tesla motors. Dealership directly owned by automakers are prohibited by an antiquated law. There was a law in the last legislative session which would have allowed Tesla to set up dealerships, but it never came up for debate. Texas' legislature only meets for 140 days each odd numbered year, but it's likely that in the next legislative session the bill will be passed.

And, you can still buy Tesla's in Texas (trust me, you see plenty in Austin and Houston). Tesla just can't open dealerships. They still have showrooms (I've been to one in Austin and one in Houston), they just can't sell the car there.