It's not serious. It still requires someone to specifically target you & your car with special gear and know-how far outside the realm of the typical car thief.
As always, relevant XKCD: https://xkcd.com/538/
See http://krebsonsecurity.com/ for plenty of examples.
It wouldn't fill me with warm and fuzzies if I were sold a high-end door lock / alarm system / safe that was only exploitable with 'special gear and know-how far outside the realm of the typical thief.'
Then you'd better never buy a high-end door lock / alarm system / safe, they all have that in common.
The issue with electronic exploitation is that the know-how component is relatively trivially automated. Script kiddies, etc.
If I bought an $80k Porche, I'd be bit miffed that it could be stolen from a parking lot in the time it took me to have a sit-down lunch.
I don't think Porche et al are under any illusions their windows are rock-proof. ;)
If you bought an $80k Porshe you knowingly bought something you know will be a target for theft, and probably have enough money to have anti-theft insurance and be able to afford the inconvenience which would be your car vanishing. Yes apparently the ease of it being stolen is slightly greater than you thought when you bought it. But if not having your car stolen was a top priority for you then you would not of bought a car which people would want to steal as much.
As they mention in the article this would of been a difficult thing to fix on existing models, they did however change the system so it doesn't apply to new models.