Sales tax is already paid when you register the car, regardless of it being bought in Cali. The positive light would be around consumer protection. Dealerships are viewed as a necessary evil when it comes to purchasing cars. Tesla could open a "store" that just has a tablet on a stand to order your car. Because the TADA/NADA are dirty and play using dirty tactics, we might be better served exposing them for what they are. I proposed a "meet and greet" with the Tesla Owners of Texas in San Antonio during the TADA state convention last year. I didn't get any takers
As for ammo against TADA, some light reading material:
http://www.tada.org/web/Images/TADA/TADA Documents/Myth vs Fact_FINAL.pdf
http://www.tada.org/web/Images/TADA/TADA Documents/Issue - Tesla Final.pdf
One of the common themes here is that they feel Tesla is going to put the dealerships out of business and all those employees will be out of a job. TM isn't trying to remove existing dealerships, they're trying to open stores to ADD to the automobile buying landscape.
In addition to the upcoming legislative session, could there be focus on overturning the existing laws? I know it would involve Tesla suing, but where would that process start?