Actually, I don't know why they don't "acquiesce" somewhat to the demands - and offer to sell to the dealers at the same price as they sell in other states.
When the dealers refuse on the basis they won't be competitive with out-of-state sales, they should surely be able to use that to force the hand of the legislature (by advertising in Texas, with the tag line "Not available in Texas because none of your dealers will sell our cars" or something). Truthful. Pins the "blame" where it belongs (the dealers).
If, OTOH the dealers accept, the customers will demand to know why Texas is 25% more expensive (and Tesla can truthfully say "We sell at the same price to all comers, dealer or private, so any difference is the dealer's margin because your state gov't won't let us sell direct to you".
I'm very interested, with Tesla apparently coming to Oz next year, to see what happens here.