You and the other reply missed the part where even the iOS AppStore doesn't make as much money to warrant them running a whole ecosystem and shutting off musicians/producers/video editors/developers/hackers/enterprise users/people using Java stuff.
Apple has backed off on harsh decisions for much less than that. Remember Final Cut X? I bet the video editing community is much smaller than the developer community. Google, as an example, uses a lot of Apple laptops. They'd instantly stop buying them if that happened.
Until there's any sign of Apple wanting to close OS X, this is purely FUD.