Nowadays, there seems to be a limit to how complex you can make an application solely for touch, the controls needs a lot more space plus removal of "unecessary" tools is so much more taken into consideration. The size of Pads and phones are also a showstopper because of their limited screen real estate. And for the desktop applications, the companies won't risk as much as creating a total redesign for their complex applications. Or maybe i'm wrong.
How big and complex can a touch application be, without being impossible to use?
Is Office with the "touch friendly" Ribbon design as far as we have come?