I think this is a great idea. They could do their best making fusion a good experience for iphone and android users, but the best experience would be on a blackberry (due to having only one OS to deal with). Non-bb users would be happy to get a nice user interface for fusion, and they would see how good the blackberries work. An android/iphone end user app for fusion would improve adoption of Fusion much much quicker, and that is what they need right now...fast (or at least steady) adoption of Fusion.
