Niche
I think there is a niche for Blackberry. All other phones are trying to be all things to all people and security is bound to suffer. Look at the problems of Apple and Android with apps gaining access to privileged data. There will always be a market for a 'real' business phone that can be managed, secured and controlled centrally. Microsoft/Nokia are going to try to grab that space by being tied in more closely to Win/Office but Rim are already there. Good decision by RIM.