How about a TV with a built in controller with fully configurable software for overlaying video and audio streams on the fly. The design I imagine would allow you to use the the devices and universal remotes that many people already own with a simple opaque overlay style user interface that would allow for on the fly browsing and selection of connected devices.
For the price they are charging you could essentially buy a PS3, and combine it with your current cable service and DVR if such a TV existed.
Disclaimer, I am not a lawyer, and I am not licensed anywhere, this is not legal advice, this does not create an attorney-client relationship.