Ideally I would want all PCs (Windows, Linux, Mac, whatever else) to be tablet screens that you plug in to a desktop docking station when you need to work. Unplug the screen and take it with you when you need mobile computing, and plug in a keyboard dock to the same screen when you need to do work on the go (think Asus Transformer + keyboard dock + desktop dock)
That would be nice, but maybe a little further would be to link to your big desk screen (multiscreen config) and link up with other devices to combine horsepower. Fujitsu have a nice concept:
http://www.slashgear.com/fujitsu-lifebook2013-concept-docks-tablet-phone-camera-in-laptop-25210621/