Apple lingered about 6 hours today before posting its special event online, and now their servers are so saturated downloads are proceeding at under 10KB/s. It took what may be the foremost media technology company in the world 6 hours to post an event, a company that produces software designed to allow extremely fast editing and production of video.
Even with all the technology available to them their servers cannot handle the demand to get the event to my Apple TV in a timely manner. This is the clearest obstacle to the Apple TV replacing other media, the network it connects to simply isn't ready yet.