I DO NOT think they are obsolete in any way. Here's my story (if you are interested):
Now that I have spent some significant time with an Exemplar 2900, I ask myself, is SACD really necessary? This player forced me to stop and think.
Prior to owning the Exemplar 2900 I owned the Sony XA777ES. SACD's on the Sony sounded very, very good to me. Way better than my redbook versions of the same discs. But after spending several months with the Exemplar I began to notice no significant difference, on many quality recordings, between the SACD and the redbook. For example, I owned two versions of Bill Evans 'Waltz for Debby': one was the SACD and one was the Super-K2 20 bit remaster. Well, on the Exemplar Denon, in my system, I could not tell a significant difference between the two, and, on a few tracks, I actually preferred the 20 bit remaster. This exeperience repeated itself a few times.
This has given me pause. It makes me wonder whether I should just go for a really high quality redbook only player and forget the whole Hi-Rez thing altogether (especially because I am two-channel and don't need DVD). While I have invested a lot of money in SACD only about 10% of them were music I re-bought and the vast majority were hybrids -- so it would not be hard to divest myself of the single-sided SACD's and keep the hybrids (which is mostly new music for me) if I wanted.
I have learned a lot and one of the things that keeps coming back to me is that maybe I just had never owned a really exceptional redbook player before the Exemplar. I have not come to any conclusions...I will definitely be auditioning hi quality redbook CDP's though in the near future. Thanks for reading,