If ios7 is just a small upgrade like ios6 was and iOS remains boring I will be switching to BB10 only.
Frankly, I would very much like a 3rd alternative in a mobile OS (WP8 is not doing it for me) but to hope that BB10 is going to be it, is, to me, pie-in-the-sky. With their resources, and the huge exodus of talent, I fully expect it to be half-baked.
With all the apparent manipulation with Apple, I would not be surprised if the 100% rise in RIM stock in recent times is not the archetypal pump and dump.