Re: wireless networking built in ...
You forget Whispernets, a la the original Kindle. The TV makers can have contracts with cell phone companies to bum some data on occasion off them, allowing the devices to sip from mobile networks without needing an additional device.
Plus they can make the devices such that if you try to sabotage the antenna, you break the device altogether...oh, and void the warranty. And since they have to plug into mains, they can probably use it as an antenna, so good luck trying to shield it with a Faraday cage.