It will be interesting to see if it just become a certain device for a certain market, or if the entire smartphone market go toward that direction.
Might end-up being a few sized screens, but like I said I think the "premium" phone will have some sort of slide-out expandable screen.
What would be cool is a phone that had a storage space for a bluetooth earpiece so it's always with your phone and just snaps out when needed....charges when snapped in and the phone is plugged in. Would be an easy route to add content and charge a premium for it.