TO me, it does not matter but I would say this:
A switch to QNX will be a smart idea for RIM in the long run because it is a posix based platform and for the people who are experts on semaphores and threaded / parallel processing QNX will respond well with the growing needs for more juice on the processors.
Also RIM should very damn hard to make sure that they do not compromise the core functionality of the BB OS so that users have not or minimum learning curve.
One thing I believe is that the RIM should not tailor its OS as par with Android or Microsoft 7 or something... Because RIM serves a very serious clientele and any drastic change could de-rail the mission.
Wish all the best to RIM and hope it will listen to its customers and the newcomers as well.
Never be silent about the things that matter, but what about Democracy? That matters too