There seem to be two camps on this one - one that says its not likely to happen, and the other that says <shrilly and hysterically>, "they snuck this in tot he contract language, and it must have been for a reason, and they're conspiring to screw all the little guys!"

Personally, after having checked this out, I think that one day we may very well see some type of tiered system, but it will happen avery slowly and will be tied to other benefits. There are just too many registrars out there for anyone to stick their neck out.