Only reason why I would consider a blackberry over a Android smartphone is the BB Services. And that is the only reason.
Why don't all the other cellphone makers get a service like blackberry's?
For interest sake, can you maybe give a list of advantages of BB that you believe will be to the advantage of iPhone and Android?
Personally, I'm an Android fan since I hate being locked down and not being able to do what I want the way I want to.
Here is my list of (BB < Android) features ...
BBM - Prefer WhatsApp, GTalk and SMS since it is just so much easier to stay in contact with someone. The BBM pin seems a bit backward to get into contact with someone.
Email - Have the same and more (afaik) in iPhone and Android
Browsing - Have the same and more (afaik) in iPhone and Android
Unlimited bandwidth - to get the "unlimited bandwidth" you are governed by another entity about what you can download or not. Plus your services have central point of failure. And "unlimited" browsing for that price on large scale would kill any telecom network if the majority of there users started to use it on a large scale and the price would skyrocket. And although I have a smallish data bundle I have only once had an issue about my monthly usage and that was when I had to download a VERY large software package from the internet, something which I would in anycase not have been able to do on a BB.
But as I stated, I am a Android-man, with respect for iPhone and quite willing to learn.
Eagerly waiting your reply...
