I agree with Paul Messenger's comments on the reason for the failure of the SACD format but I must note, another obvious reason.
I, after a good bit of saving, bought a Sony SACD unit when the price dropped below $1000. I also promptly bought a half dozen disks...ALL well recorded dross by 3rd rate artists.
Every single SACD disk I bought over the next 6 months was the same...
I gave up and gladly went back to CD. I realize much has changed over the last decade but it is far too late to save that format.