I'm with Kal on this one. Fortunately, there were not all that many SACD only titles released after the first few years. I would imagine that most collections, my own included, only have a few of these titles. If I count the SACD only releases and the hybrids, I have about 200 titles.
What has started me thinking is that my SONY SCD555 ES SACD player is closing in on 5 years and these models have reportedly had a bad habit of breaking down after the warranty period expires and SONY has not been the greatest at servicing these models. If you were to believe all the stories over at Audio Asylum, every SACD player seems to break down quicker than its redbook counterpart. If the SONY does go down, I would be probably replace it with a redbook only CD player, like a Rega or Creek.
Regards, Rich