Although the current support from Blackberry is lacking the real issue is the average user for cell service wants instant response to just about everything they do including instant messaging, When the various company move to satisfy the " I gota have it now crowd" then all logic and security goes out the window. Security takes added requirements and users from all cell companys using any type phone not just blackberry’s don't want added delays. As the phones start to have more and more control for things like paying at the store by just doing a swipe you will see even more hacking.
Reality the least secure phone is the I-phone followed close by an Android phone. It may be time to go back to the wired to the pole phones.
As for BBM. instead of blaming blackberry I would look at who and how the email got out. Also look at the password your using on various things and change them.