Hmm, probably one of the most illogical arguments, I've ever heard on the Internet.
Miranda Rights...just be glad you've had them so long.
Car Loan Contract: "Hey you had a 5% interest rate, but now its 10%, be glad it was that low for so long."
This is why people are so easily bowled over into thinking its okay to give up Second Amendment rights, etc...because they are just thankful they had it so long. I have unlimited data...yes...because I signed up for it when it was available, and they are contractually obligated to continue to give it to me as long as we have a binding agreement. Until I change the arrangement or opt-out of the original contract, it is mine. If they fail to offer it, that is a failure to meet a contractual obligation. If i decide that my tenant renter should pay more in the middle of their lease, I'm going to lose my keester in court.
Plus, technical advancements shouldn't mean I have to give-up more to participate, I should be getting more. i.e., Facetime is a newer technology for cellular subscribers, but so is HSPA+, LTE, and whatever is next. Its called an evolution. Being forced to change my plan to get what everyone else already has is like being forced to move houses to get USPS mail service. They have the technology to throttle, and they do it already, Facetime isn't going to change the bottom line.
Bottom line: AT&T has realized that it's their rodeo and we are just the clowns. Travel to any EU country and see how little power the conglomerate cell company has. The only thing they offer is data per MB and its up to you to figure out what its worth to you.