The same sort of thing ultimately will happen in broadband access as well, as users start to experience greater pain paying separately, by the device, by the form of access, by the place for their broadband access services.
Both AT&T and Verizon already have spoken about a future scenario where an authorized user can use wireless and wired broadband access, across multiple devices. Think of it as a sort of family plan for individual users, where the "family" includes all the communications-capable devices a particular user wants to use.
If you think the future will feature communications need for a wide variety of appliances, used across home and mobile enviornments, but with differing usage characteristics, a unified plan makes sense.