On the one hand, we can't even get manufacturers of our phones to keep the software on their devices up to date past a couple years and somehow they're our last hope for your in-dash media player? I guess some people jump to a new lease every couple years, but I don't see the mobile model being the future of car ownership.
On the other hand, cars have mostly avoided the security disasters of other embedded devices so it might be fine. Unless of course, we make them into the eventual IoT device everyone wants them to be. I mean these software-controlled navs now need to both downloads updated maps and show you engine diagnostics. Doesn't this seem like a bad idea waiting to happen?
It sucks that only the low-quality models can escape these devices. Soon it'll be like Smart TVs where your choices are 480x600 or 4K Samsung SpywarePro.patchfix-m2015.