My guess is that the CD is just too convenient, workable,
and cost effective (and well entrenched) to be removed from the picture
for some time. Unlike the LP record, which had huge disadvantages that
made it an unhappy medium for lots of people, the CD remains an advanced
way for people to conveniently enjoy music on home-audio systems.
Vinyl records were massively entrenched and are still in the picture now,
unlike other technolgies which have come & gone, or are on their way out.
Can any other technology boast of being playable still in 100 years?
http://en.wikipedia.org/wiki/Vinyl_record#History
Cheers,
Ric