Some people believed that BlackBerry OS 10 will die prematurely due to long delays and lack of innovation from RIM's developers. Well, in my opinion, this could happen in reality, since RIM is now planning to release BlackBerry OS 10 next January, while Android and iOS are moving ahead with their development.
I think RIM must work on something amazing to keep up with other vendors who deliver something out of the box, not just depending on one technology only (such as BBM in RIM's case). BBM is no longer a powerful concept since many other service are available and can replace BBM, such as iMessage and WhatsApp.
If they don't react fast and do something during this year, i believe they will have a much heavier challenge next year where Android and iOS will keep dominating the phone market.