The idea of doing anything *real* (video editing, graphics, compositing, design work, even most real office type work: spreadsheets, graphs, anything beyond the most basic word processing, programming, etc) on most mobile devices smaller than a laptop is laughable to me.
Someday when mobile devices are truly powerful enough to dock at a desk to several full sized monitors, keyboard and all other I/O and storage options to the point I could comfortably edit a film with it, THEN I'll truly replace my desktop with a mobile device.
Until that FAR OFF day, I love my mobile devices as the best possible stand-in for when nothing else more powerful is available or convenient, and for a totally different set of tasks than a desktop or even laptop.