In the future, apparently we’ll only have one computer – a smartphone that plugs into a docking station. If a docking station is needed to work, and I need to work on the move then I still need more than a smartphone.
I prefer the future laid out by Ben Thompson:
multiple devices linked by the cloud.
The conclusion was that a smaller iPad would need a different resolution. It would still be tough to do fine-grained work.
A reasonably sized smart phone is fine for surfing the net, watching movies and replying to email (although I’m still sad when the keyboard takes over half my screen). For working, although you can make do with one in extremis, either a larger device or a completely new interface is required.