Well, what I've been thinking about for a while is a kind of very-high-quality multi-tuner. A single box that picks up external signals, from over-the-air TV (SD & HD), all terrestrial radio (AM, FM, digital), both satellite radio systems, and also a universal set-top box, with all the features that have been missing, including decoding the DD 5.1 directly into 5 analog channels, and agreements with the cable and satellite companies to handle their various encryption schemes.
I suspect
there are a few requirements and design issues with such a box, but I'd love to have one.