It's not a show-stopper. It's not even close to being a show-stopper any more than having keys is also a vulnerability to having a car stolen.
All you have to do is keep the fob inside a shielded case at home and you're fine.
All you have to do is keep the fob inside a shielded case at home and you're fine.
Because we all have Faraday cages in our homes, and I'm sure the salesman who sold the car also made the customer aware of this vulnerability. /sarcasm.
Yes, most people who own cars new enough to have this vulnerability own microwave ovens.