The weird thing is that Microsoft seems to have all the pieces necessary. If they just make a new shell the multi-touch, gestures, system-wide search, etc, etc

The weird thing is that Microsoft seems to have all the pieces necessary. If they just make a new shell the multi-touch, gestures, system-wide search, etc, etc is already there. WPF apps are probably easy ports since they are coded in a pretty semantic way. How hard could be to make a shell inspired by the Metro UI scheme?