The decline of CES is dues to the decline of the US dealer base. They don't come to CES anymore, or not enough of them exist any more. Hence, distributors and importers no longer have an incentive to be at the show.
If you look at CES from the perspective of an audiophile getting your jollys, you should be disappointed. I totally agree with metaphacts. I am more concerned with the decline of the US hifi industry.