I know it's anathema to gadget lovers, but why renew down the road if it means you have to take a new, bucketed contract? Once your contract "ends" it doesn't mean the service stops, it just means you go month-to-month. If you still like your "magical" device, you can keep liking it, and its unlimited minutes, assuming they don't issue a press release that they're going to force such people into signing a new contract.
I really feel sorry for bucketed smartphone users. (3 Sprint for now)