Something the Internet TV crowd doesn't get.
Streaming video is really pretty marginal, even when you have really fast internet. I've got cox cable at my house, which has unbelievable speeds. But that's only if it's being fed a fast data stream.
I watch streaming Netflix all the time through a hard-wired Xbox (there's no way to get any faster, and this is MUCH faster than could ever be accomplished with current wireless tech of any kind deployed in households), and it's still only of meh quality.
The servers pushing through the video are clearly not up to the task, because the quality zips between HD and barely-better-than-youtube with some frequency.
On any portable device, reliable, high-def streams are simply a pipe dream, and I believe they'll stay that way for at least 5-10 years, because of the simple problem that streaming video like this through the internet (as opposed to HD broadcast) does not scale.
Every additional user signed up stresses the system more and costs the provider more for bandwidth. The more popular it gets, in the absence of major infrastructure investment that is probably not forthcoming, the worse the quality is likely to get.