Apple is making the exact same mistake the RIM made. They've gone from targeting hardcore fans, to targeting teenagers. The problem is that teenagers are quick to jump ship to the coolest new thing. Apple has been making "coolest new thing" for a while, but they're getting really popular now, which seems to be inversely proportional to "cool". For RIM, they moved away from targeting hardcore, email-addicted business…
Maybe my experience is warped, but if I had to stereotype I'd say it's younger people walking around with Android phones and older well-off businesspeople walking around with iPhones. I'm not sure "targeting teenagers" really holds.
The people I know who still use Blackberries? Both of them are hardcore fans. Back in the 90s, every Mac user I knew was a hardcore fan… all five or so of them.
Apple is what it is today because it started selling to everyone else. RIM is what it is today because it hasn't yet figured out how to do that.