People who try to do this with their own URLs will only succeed in making it harder for other folks to access their sites. People who build multilingual URL support into their net browsers will only end up making them harder to use. This same argument surfaces from time to time in the email world. Yes, I'm familiar with 1522. It's really no different than people insisting on meaningful telex addresses or meaningful phone numbers.
Any worldwide address needs to be in a universal, widely available, character set.
We already have this. My point is that things are just going to go more in this direction. One of the big reasons for links becoming stale is that we want to use file naming hierarchies to help us organize our files. But this conflicts with the need to produce stable identifiers for use by the outside world, because you have to reorganize hierarchies once in awhile. That same layer can also provide charset mapping with little additional cost, and without breaking people's ability to type URLs.