I'm not sure what you mean by your last sentence. Sure, you might have to work a bit to be able to change your locale to Klingon, and input that -- but for something for which unicode is actually useful, like Japanese, there's been input solutions for a long time (predating unicode, as you need a wide character set for such languages).

And unicode is of course easy to use with "less exotic" languages like Norwegian that can't be represented in basic 127-bit ascii -- via a simple keyboard map.