SACD's only compelling feature is the multi-channel ability. In every other way, it is a step back from CD.
1) No feasible way to archive it to a PC for versatile use.
2) No feasible way to rip the digital data and convert to a format for use on portable players.
3) No universal digital output feed to use on your choice of DACs or other digital input selection devices.
4) DSD is not proven to have any real-world advantages over PCM. DSD only entails more expensive and additional purchases for engineers to buy specialized mixing desks. In reality, most convert DSD to PCM and back to DSD after editing, defeating any supposed advantage the DSD was supposed to have in the first place. Quantifiably, DSD has lower resolution than PCM(even less than CDs), once you get into the treble band.
5) SACD and DVD-A do seem to have one advantage that is real besides multi-channel: They are not so often compromised on purpose as CD releases. You can find examples of SACDs and DVD-As that are superior mixes/masters as compared to the CD versions, as the CD versions are almost always mixed to sound the loudest, not to sound the best. Note: the CD layer on a SACD is usually the same master as the regular CD, where as the SACD layer is usually a different mastered version.
-Chris