You can hack and customize a "phone" minicomputer, and I believe you can still find pure cellular telephones with basic OS in case you prefer to keep telephony and personal assistant separate; I am not informed that you can do the same with cars, and I very surely do not want an internet connected door, fridge, vehicle, wife to begin with.
The more reliable it has to be, the least possibly connected you want it.
I am not sure it is so possible to remove or disable the «junk you don't want from your car». Already for the mentioned 'e-call', that law mandated that it has to be installed and cannot be removed by the user - only by the manufacturer. And you will very probably have to struggle to get that done ("We cannot" // "Yes you must" etc). I suppose those vehicles will have a high degree of integration - you cannot just remove pieces.
