TADA seems to have bought key politicians. The leadership of both parties support changing the law, but it failed last time because a key Democrat from Houston kept it bottled up in committee. She has been re-elected over a dozen times and is on record as having taken money from TADA. I'm surprised that Rick Perry says he favors direct sales, but he's no longer governor. Sadly Abbott sides with the dealers.
Yes, Texas was the #3 state in new Tesla registrations last year, behind California and Florida.
Although I support direct sales, I'm don't think the current situation is impeding sales. I bought my MS online, and it was the smoothest car purchase I've ever had. When I bought my previous vehicle, a Prius, I had to argue with some douche in a cubicle about him trying to charge me a $300 fee for a lifetime supply of "dry air" for my tires. If the dealers are protecting us from the manufacturers, who the hell is protecting us from the dealers???
The only quirks I noticed in the process was that Tesla has to do a little do-si-do around regulations. You go to the web site for prices, and you call California for test drives. Financing is done though 3rd party referral. When your car arrives, you have to register it yourself rather that pay a dealer a fee to do it for you. I'd say that anybody that can afford a Tesla has the brainpower to complete the process. It might be different if they sold $20k cars, but they don't.