No I think it more circumstances, or the circumstances of your friends....
What's clear is that most people in the world do not use WhatsApp, but of those that are using some form of IM.... WhatsApps seems to be the dominate player these days.
I think for a big portion of remaining BlackBerry users... India, Indonesia, South Africa. The loss of WhatsApp will hasten the move away from BBOS and BB10.