The mega laptop is a dead evolutionary path, because it does its two priorities badly. It's not a good portable, and it's not a good desktop because you have fixed eye position and no configuration opportunity.
I expect the design that dominates the future will involve computers with the form factor of a phone. Users will run a lead between this and a unit that multiplexes one to many monitors when they want monitors, and be able to plug in an external keyboard. I wonder how long it is until mac laptops get offered where they're just a dumb housing for an iphone unit?