I think the next big thing, is still a few years away, and that is the replacement of the HTIB with the HTPCIB. That is, a home theater PC that truly does it all. Simplification is what people are always after, and M$ is poised to deliver.
A next generation Media Center PC that actually boots up like a normal piece of A/V gear. But, then it allows for a Netflix like download of HD content direct to the box. It allows for CableCard or SatelliteCard connectivity for the television viewing of your choice. Includes full DVR capabilities. Allows for full networking of your video throughout your home to all compliant devices easily. Includes MMC and the like so you can make legitimate copies of your videos directly to the box and see them anywhere in your home, then put the discs away for safe keeping. All over some version of wi-fi... nice and easy, plug and play, little to no configuration, and almost entirely silent.
Yeah, maybe a few years away yet.