"Very concerning"? For you, maybe. To me, this smacks of concern trolling. You are aware that all modern cars have a lot of software and microcontrollers embedded in their designs, right?
BTW, there is no evidence, at least none you have cited or even referred to, that the Tesla computer is "becoming increasingly complex". All we see in this article is that they are changing one variable in their existing system. That's not increased complexity.
Correct me if I'm wrong but I don't think many cars on the market are able to receive over-the-air updates to their systems. I think that's what the parent was talking about specifically.
All of the cars I've driven have been accessible by ODB2 or something similar, which is a physical connection under the hood and/or steering column.
In addition to OnStar already mentioned, some Audi can over wifi/cell. Also the OEMs that use Tegra have this capability though I know of none that have enabled any OTA updates over wifi. Hyundai/Kia had beta hardware that did it over BT a year ago.
BTW, there is no evidence, at least none you have cited or even referred to, that the Tesla computer is "becoming increasingly complex". All we see in this article is that they are changing one variable in their existing system. That's not increased complexity.