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Why? The problem isn't with the phones. The Z10 and Q10 are fantastic and BB10 is probably the best business-centric OS ever written. The problem is that the applications are just not there, and that people associate BlackBerry with reboots, battery pulls, and outdated, clunky software, even though that's not the case. It's an image problem, not a phone problem. They can't market like Apple used to. If they could, th…
It doesn't matter if their flagship phone that's out today is better than any mobile device that comes out in the next ten years. The customer has a grudge against them and decided they're losers. I could only image how much people would be for cancer if BB came out with a cure.
Ecosystem is everything. Android overcame that (remember when few of the top tier apps or services like Netflix were available on Android?) largely via the pull of Google services, getting enough inertia that the apps came. Blackberry...it wasn't and isn't going to happen. It just isn't worth it for makers.
Blackberry can't just make a device that is as good as the competitors, it has to be significantly better. They didn't do that.