I'm somewhat unclear on the concept.
I like my Sandisk M200 series MP3 players (the thumb shaped ones) that have a finite amount of memory built in. I believe the maximum is 4 gig but ours are 1 and 2 gig units.
I would like to be able to "switch out" the songs by simply replacing a mamory card. That would afford a virtually unlimited capacity. If that's what these new units do, I can see where this will be a boon. I'd go for this as long as I could program my own memory cards.
So far, so good.
If, OTOH, they can ONLY play pre-recorded memory cards that have ful lalbums on them, I don't see this successfully prying any more money out of me, or too many other sentient beings, either.
But, this might be the first foray in the move to get rid of CDs and replace them with memory cards. After all, it's more efficient to burn firmware than the actually manufacture CD's.
Now, if this is the merely functional linear equivalent to a CD and I can play these at home with another unit, akin to a CD player and "pick and choose" what I want from a computer and make my own memory cards, I'm not too against that. The hardware to play it on having no moving parts or expensive lasers to malfunction is a difficult concept to argue against.