Personally speaking I feel that any disc format, no matter how hi def, is probably a bit of a stop gap untill high quality downloading including the soundtrack, is well and truly up and running.
Lets face it cd's and dvd's were revolutionary (from audio tape cassettes and vhs) and upping the ant'e to higher quality but still via a disc is more evolutionary, your still using up valuable home space.
But what would be revolutionary is to download onto a version of sd card or memory stick etc etc, and have storage space kept to an absolute minimum.
Just think of it hundreds of films to own in high def but on little storage mediums with no moving parts taking up hardly any space at home, it will eventually happen.
Remember we had a stylus physicaly touching your LP's as opposed to a laser beam reading via a light. Ok, ok I know some people will argue the analogue vs digital debate....but.