Anything above 1080p resolution is a waste on any set below 110"-150" or so. We simply will not see an increase in detail.
There will be no need for higher res formats. The current blu-ray/hd-dvd media storage capacity would probably have to increase 10x to fit true 4000 x 4000 resolution on a disc.
Blu-ray is relevant, but not a necessity. A 768p set done properly can easily outperform an ill-conceived 1080p set.