as a computer engineer, I will assure you an all electric vehicle will be susceptible to remote shutoff.
the fact that such a system would be physically hooked to a charger would also be far too tempting not to build in a back door. such a system would also have ‘call home’ capabilities to download various bits of data while being open to remote commands.
and there are examples of the electronic systems of cars being remotely accessed all over the net. do you need assistance with google?
Heck, people have had remote starters for ‘gas’ powered cars for years.
If you can start it remotely, you can stop it remotely.
I think you are confusing remote access with local access. Yes, any car can have its electronics accessed by physically connecting a compatible device to the OBD-II port. Mechanics do this all the time in order to run diagnostics.
Remote access, on the other hand, is a completely different animal. There are articles about the possibility of this happening to cars in general. In 2011 the NY Times wrote an article which said, in part, “Although no such takeovers have been reported in the real world, the scientists were able to do exactly this in an experiment conducted on a car they bought for the purpose of trying to hack it.”
http://www.nytimes.com/2011/03/10/business/10hack.html
The car that they used to test their hacks on was a regular gasoline car. Like I said, the ability to remotely access a vehicle has nothing to do with whether the car uses a battery or gasoline.
If I am wrong, please provide a link to a report of an electric vehicle being remotely controlled.