People said the exact same thing about RF car fobs years ago. It is only a matter of time before the technology comes down in price and the software for doing this type of thing becomes more common. Never say never.
Cars are laughably insecure by computing standards, but yet stolen cars are at a low (when you adjust for total cars). They're also targeting pre-digital cars still on the road, if you look at the DMV's "top stolen cars" list, they're almost all 1990s cars or older.
You read a few stories about the "Russian maffia" having key fobs which can unlock modern cars, but these are few and far between. Even the more common ODB-II port key reset method is fairly rare, but gets heavily reported when it does occur.
So I'm going to use the same example, but use that example as evidence that this won't become common: just like cars, and garage door openers.
