SACD was a stop gap profit scheme for Sony, they milked audiophiles and technophiles who bought unneccesary equipment and have incompatible software.
DVD-A is the future format, always was and always will be. CD is already had its day and if you ask any manufacturer how hard it is to get a CD transport these days you would know. Luckily DVD transports are compatible with CD's!
Sony is a four letter word for a reason, and yet another exploitation of the buying public buy Sony with a technology which was dead end from the day it was released.
Until you have a compatible standard digital output on any of these new technologies they technically don't exist, so DVD-A really does not exist yet. Its in mid birth.
Oh! and by the way, the improvement in the formats had nothing to do with expanding bits, but expanding channels.
Its likely the thought of a spinning disc and all its problems will be laughable concept ten years from now.