Mobile PC Vs. UMPC

Will a Mobile PC be the future of World or the Ultra mobile PC. The debate is eternal. But people say that the learning curve for mobile computer would be easier to scale by commoners since they are comfortable and used to the Mobile interface. So will the Mobile PC become ubiquitous in the future. Yes it will say experts. But then there are people who say that existing applications can be easily modified to become avialble on UMPC whereas for mobile fresh applications have to be written. But I am sure that business men will understand that user needs have to dictate demand and not the other way round and that in future every BOP member will flaunt a Mobile PC with pride.Say what.