I think for the small ones, but the larger ones might just be a simple thing. Of course I have no clue I don't code or do anything remotely similar. But you could very well be right the market is very small.If you really think about it though, there’s what a few million Teslas on the road? But for app developers, that’s at least 100 orders of magnitude fewer devices than iOS or Android. Probably wouldn’t be a priority for any dev unless drivers had some targeted campaign or petition begging for support.
There has been CarPlay for the Tesla for a while through some 3rd party devices and some work arounds. If this is what they come out with it would certainly take the Tesla down a few notches in the modern clean UI department.