Having spent the last decade deploying a very homogeneous collection of hardware around the world, the idea makes some amount of sense as an evolutionary step.
I don't see this happening in PC-land (Windows-based or or otherwise) because of huge variations in hardware configuration.
I can definitely imagine Apple moving to cloud-booting ipads/iphones/imacs/appleTV's/whatevers.
Of course, at that point who really owns (pwns) your hardware? Hmm.