I agree with you, it happened to BB and it could happen to any company.BlackBerry fans 3-4 years ago kept saying the same thing.
But in the end, it's not only about the company making money, market share IS important. Phone sales are all about the eco-system. BB10 is an amazing mobile OS. But not enough phones sold (market share) to attract developers. That is where market share is important. If your share goes below a certain percentage, it stops making sense to write and support apps for that platform. And from there it's a death spiral.
Apple fans are their own worst enemies. Android has software features that are miles ahead of iOS. Maps, the voice assistant, Google Now. Yet there is a lot of bitching here about how the look of the iPhone has not changed. About how we need a 4K display. really? 5" display, you really think you'll notice the difference?
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Yes, it could. App developers write for Android and iOS because those 2 combine for nearly 98% of the market. Both being a fairly significant number. At what point does a developer decide that writing an app for a platform that has only x% of the market is no longer worth it? 1%, 5%, 10%, 15%?
But let's be real now and take stock, It's not happening to Apple.
@Michael Scrip above me, addressed the points I would have addressed.