Idea #2524: Any future OS should be able to be taken away by the user

Is it possible for a computer to have only RAM plus an extremely little HDD and OS, in order to any individual use as HDD a simple stick? I think that any future OS should be able to boot from memory sticks. Also, I think that the next desirable OS's will be very slender. So:
ANY IMPROVEMENT FOR THE NEXT UBUNTU OS MUST BE - FIRST OF ALL - USEFUL, THEN SLENDER AND, FINALLY, IT SHOULD BE EASILY TAKEN AWAY, BOOTABLE ON ANY COMPUTER. Maybe, the next public computers could be used with (any kind of) simple memory stick.

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