Sadly it will render some older connected car's features inoperable as well. Not that many people keep a car for more than 10 years anymore these days. Well besides me.
You bring up a interesting issue. I have a 1985 car that is still quite usable. Some parts are hard to find, such as trim, but otherwise I can service it when needed. Enter new vehicles that are becoming more connected. Unless the electronics are designed for upgrading, you could well wind up with a car that is not repairable once it can no longer connect to the network. For example, some cars currently require you reset stored values after service, and currently use the OBDC connection. If manufacturers decide to use cloud based diagnostics and not add a diagnostic port or wifi/bluetooth car owners will be at the mercy of mobile operators.