> The fact that it's not in widespread use is my point exactly: the mass market isn't there any more.

Their might not be a mass market for neither, but these are not available in the same scale at all. You maybe can find blu ray audio somewhere on the internet, but I've never seen them, while the the music store has hundreds of CDs and every street musician and band sells CDs.

I honestly do not know what the selling point of a Blu-ray disk is. The form factor is exactly the same and nobody needs the capacity. The capacity of a DVD is already too large, why should anyone use a Blue-ray disk? Neither want the musicians produce and sell more than some hours of music, nor do consumers need music for days without interruption. There simply is no kind of music which takes more than a few hours.

So the only difference is that the disk is more expensive and the player is likely incompatible, so hardly a benefit.

> So do I - they're in a box somewhere.

I was only talking about players in use.