Don't believe the rumors, they are and will continue to honor grandfathered plans, you just will have to but your phone used or pay retail price because if you change/renew, they will force the data plan change.
I currently have these on a family plan, you well be able to choose what level of voice/text you want without it messing with your data.
We can do an AOL for free. Just take them. I do have a Rezound I'm selling if interested.