BlackBerry aka RIMM aka whatever the hell they're calling themselves today to disguise the smell of the stinking corpse is just another modem era data warehousing company that probably uses and requires less computer power and storage than I have in my experimental lab, or would if they were sane and didn't keep copies of through traffic (an utterly stupid thing that no common carrier should ever START doing, I even turn some logs off by default). Oh, and if their software was worth a hoot.
Back when they were competing with 24kbps models RIMM had something going for them. Now that 802.11g is a given and 802.11n and direct dual mode gigabit ethernet are common it's sort of toast.
I have very little doubt that BBM will quickly and swiftly displace WhatsApp and other irrelevant messaging platforms (Chaton, I-messages etc). However, BBM, with voice and video calls, will also compete with Skype as the desktop version cannot be far away. What may appear to some as a free loving giveaway is actually masking an aggressive land grab.