Pretty much all of the carriers are moving (or have already moved) away from unlimited plans. While I agree that it sucks, I'm not sure it matters that much, you can get the cheaper plans and do just fine with them unless you're a super duper hardcore user. For those people, yeah, definitely sucks.
I'm grandfathered on an unlimited plan for now at least, but I'm sure they'll find a way to force me to change it.