Curiously, the friday a girl on a shop, after knowing that I am a software developer, asked me what will be next big thing in the field. And I said something similar, using your mobile phone as your main computer, connecting it to a couple of external devices (screen, keyboard, maybe a hard drive)…
Even more, in the future is even possible that the phone is another external device, and the core of the system (with your data, etc) is an even smaller device…
The improvements on the mobile phones in the last 5 years has been absolutely astonishing…