My answer on Quora:
It's a much more expensive proposition to stream to a set top box than it is to stream to the web. The technology is very wide and varied between the differing platforms, which takes up a lot of development resources. Typically, if you want to go to mainstream platforms (like the xBox or iOS), you've got to use a completely different streaming server solution, and all the live streaming platforms you mention are pretty in bed with the Flash Media Server suite.
I'm posting this here partially to test the integration between WordPress, and partially to put a pin into this topic. From a strategic position, at least on the surface, it seems like a pretty good idea to go for the living room if you're these guys, but there's a nuanced opinion in my mind forming around this that may explain the lack of live streaming presence in people's living rooms. So – more on this later. Probably.