Gotta disagree with you on this one. Unless it's a niche model, laptops are not designed around touch screens, and even then, the screen does not contain all the hardware needed to make the device function. If you tried detaching the keyboard from a laptop, you'd have just destroyed the device.
Tablets are designed around a primarily touch-based interface that can function without a keyboard. They generally have extremely limited connectivity options for peripherals and typically are not built upon an x86 architecture.
While I love a good tablet, adding a keyboard and calling it a laptop won't cut it but it when it comes time to do the same work I would with a full-fledged laptop.