That sounds terrible. I want what an AC said, the super-powerful tablet that is easily docked and immediately starts acting like a desktop computer when I want it to.
The appliance model is a waste of money and resources - not just raw materials, but R&D. And the appliance model doesn't even last in the wild. Cell phones took about five years to be "ubiquitous, but just a phone" to "ubiquitous, and I can debug code on them".
Consumers have pretty clearly demonstrated a desire for one object that does everything; yes, my home has a work laptop, a home laptop, and an Android smartphone. Is that contradictory? Nah. I'd argue the marketplace hasn't yet evolved into offering that single omnidevice, so instead we have different products that do 90% of what the other devices do, and 10% is something special.
We'll get there, but I don't think it'll happen in five years, and I think it's going to look a lot more like a laptop with a bunch of modular accessories than a flat sheet that remains as it is.