BlackBerry's biggest mistake was they were not willing to change and adapt to a newer era. They didn't know how. Same with Atari for video games or mobile pioneers like Motorola and Nokia.
Physical QWERTY went out of fashion once displays got bigger and bigger and with better 3rd party keyboards like SwiftKey and Swype.
BlackBerry only catered to the business sector which was a bigger demographic in the previous generation of the smartphone era. But once most consumers finally moved away from feature phones like the RAZR to the consumer-friendly iOS and Android ecosystem, the business sector shrank. Now most of the business sector or famous celebrities went from owning a BlackBerry to owning iPhones.
Not enough services and apps to keep an ecosystem intact and continue to exist.
BlackBerry stuck with their old ways and got left in the dust. BB10 was just way too late.
Motorola is doing ok right now. At least with the Moto G and E's. Nokia is the one company I am confused about. I thought back in 2011 that WP would be 2nd place after three years. I was completely wrong with that prediction and I now know why. Nokia confuses me. Owned by Microsoft with their label over Lumia phones but Nokia still makes Android phones and tablet? Supposedly Nokia will make a smartphone comeback next year? I really don't know what Nokia wants to do after they continued to use resistive screens two years after iPhone 2G. But Nokia is the one I want to see make a comeback. BlackBerry? I don't really care. They didn't really bring anything innovative to the industry except email push support and BBM that Apple copied with iMessages. Like a more popular Palm that got alot of hype it didn't deserve when smartphone competition wasn't as strong or refined like it is now. Typing on QWERTY is a joke now and much slower. Windows Mobile, Symbian, and Palm OS all dead platforms. BlackBerry is next.
Typing on a QWERY is slower? .... Nope! Yeah its slower than T9 but its not slower than software keyboard cause software keyboards are still in crap phase, completely underutilized. Funny how over almost twenty years after the fastest way to type is still with those 6 hardware keys. T9 is phenomenal.
As far as the Qwerty goes its not about typing, its about having many hardware keyboard buttons that do lots of things. For example you cant call a contact with one tap from your iPhone, you cant turn on a flashlight with one tap, you cant compose a new message with one tap, you cant tell your phone to navigate you home with one tap. All those things are available with your QWERTY. Its about being more efficient.