I think, more to the point, it won't matter that much for developed (internet-wise) countries just because there are a thousand ways to navigate to a site that we all use, and the complexity of the domain name isn't that relevant. Yeah, I think Microsoft could convert its domain names, so that it had vista.microsoft and windows.microsoft and xbox.microsoft, but meh? Will it really help anyone reach the net?
The scripts listed -- Cyrillic, Mandarin, Arabic, and Devanagari, are certainly very important. But even for the developed world, it would seem like there is a lot of business sense in fast tracking Hangul and the Japanese kanas. Plus why not just approve Unicode domain names? Why, when Unicode exists and is widely implemented, continue to discriminate against smaller countries and ethnic groups that use less common alphabets or syllabaries?