If this is really a thing,phising sites would only become more complicated to identify in the future.
A quick check for the first domain registrar shows that it won't work.
@up, Browsers now showing cyrilic charactes as xn--(digit), but in the past it was able to make indentical copy of domain with these characters.
Testing
wallet.com brings me to
http://www.xn--wllt-53d6a.com/ indeed (which doesn't exist). Note that I really typed this:
[url=www.wallet.com]wallet.com[/url]
My browser changes it already. Nice catch!