[Wishful thinking] Blackberry OS will be continuing after all.
Check this report :
BlackBerry discusses long-term plans for BB10 operating system, despite recent Android push
I guess blackberry won't give up on her own OS, It will keep fighting till the very last end.
I believe that there is a big surprise for ßlackßerry OS users, blackberry OS merged somehow with android to make the perfect due, perfect OS, bb10 smoothness and gestures and hub with android play store and all the apps working fluently together.
It's not impossible, actually I think it's very possible because we're on 2017!!
From my silver edition BlackBerry® Passport