I am not a car thief, nor am I or anyone I know involved with law enforcement. However, based upon anecdotal evidence, car thefts fall into several categories:
--Rite of passage or initiation requirement for gang membership; --Enabling of commission of other crimes like robbery or kidnapping; --joyriding; --break in for theft of easily fenced personal property or auto components. These types of thefts are likely eliminated because of Tesla's fob and all-electric infrastructure, not to mention the general lack of intelligence of these sorts of thieves. Time is of the essence for these folks.
However, the area of most concern would be when Teslas become more popular. There is a whole underworld of chop shops and crooked body repair shops and export companies that have orders for body and drive train parts of selected makes and models for the more expensive or popular automobiles. Stolen parts can be passed off and sold as "factory new;" they can be exported to other countries for cheap replacements; they can be used to modernize an older model.
While I believe that this sort of theft is nil today, we have no way of knowing just how extensive the knowledge of the vulnerability of Tesla's anti-theft controls will become available to tow truck drivers, disgruntled service center employees, tire companies, and others in the future as popularity soars.
Doubtless Tesla will try to stay a step or two ahead of the thieves, but if you give a skilled car thief enough time, he can steal anything--even if he has to tow it away!