The problems with HD video are storage and distribution.
Optical disks and good compression are the best solution
right now.
1920x1080i uncompressed video is over 400GB an hour
even SD uncompressed is 90 gigs an hour. Compression codecs
and computing horsepower have brought these sizes down to a
usable size and bitrate to allow for disk based delivery, storage
and playback.
Very few want to store almost a terabyte of data on a fast sata
array just to watch "death race 2000". Compression and disks
let us watch high quality at home without the massive storage
and bandwidth needed for uncompressed playback. The good
news is that the compression used is very,very good the bad
news is that its still alot of data.
Consumers have shown with mp3 that convience will win over
quality and I think that we will be with the 1920x1080 video
as the highend of domestic video for along time.
I do think that we will see more optical disk formats just not
new video formats.