Sure, but I think people are getting tired of that kind of lock in, and it seems difficult to recreate. Granted, most iPhone users are probably tied to the platform for life because they spent 100s of dollars on apps already. Then again, most of them probably aren't as essential as MS Office.

Also I think the professional companies will simply hire people to port their apps to every platform, no matter how painful it is. Some indie games might be missed, but even then - if they are successful, they probably make enough money to pay for a port.