I posted on your software thread that EMI has just made a new commitment to producing more SACD and DVD-A titles. Not enough titles has always been one of the problems with the new formats as others have already stated.
You can never tell. The original laserdiscs came out before the CD. They were the same size as LP records, to they should not have seemed strange to anyone. However they never caught on with the general public; only with "Videophiles". Now however, DVDs are hot with Joe Consumer. And actually I find the picture quality still slightly better on many of the better laserdiscs. The compression to get all that data on a DVD is not quite there yet IMHO. But since they look better than VHS, most don't know and could care less.
People like George Lucas and Steve Jobs are always pushing forward for better sound and pictures, so I think we will always see improvement.