There's a lot more to an Operating System than just the interface. I think there's a fair amount of room for improvement in all current OSs.
The interface is what matters, not what is under the hood. iOS proved that. Symbian and Windows Mobile were more powerful, more complete and in the case of Symbian more efficient (hence Nokia phones have slower CPUs). But WInMo and Symbian have god awful interfaces.
Computing power has peaked in many senses. There's all that power yet the software isn't written to take advantage of it. Multi-core programming isn't easy.
I don't agree that the day of the desktop is past, but that's another matter. It's a mistake to consider only individual ownership and ignore the corporate world. There is still a lot of room for innovation there to reduce the TCO of computers.
It is past in many ways, big desktop computers that sit on a desk are selling less and less all the time. A laptop can't be carried around and operated while standing. There are many jobs where a computer on a desk limits the efficiency of that job.
Full blown computers are best at creative things, there are plenty of people who just consume and aren't creating.



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