I pretty much listen only to sacd, and have for nearly the past year. To me, it's just better sounding than cd, period.
I listen mostly to classical, and some old jazz. Pop music of most genre's is just not what I listen to.
And it so happens that most sacd releases are classical and old jazz. And I think this is where sacd's strengths really shine.
I only have a 2 channel system, and MC is not really on the horizon. Sacd gives a bigger sound, with a lot more sound in the lower third of the frequency spectrum. This is a generalization, but seems to hold.
An MC surround system has enormous potential for music if well done, and clearly really gets the most out of a Hi Rez disc. But the extra amps, speakers, and such is all a bit much at the moment.
We now seem to be in a multi format era, and there seems to be something for everyone's taste. The mass market is clearly all cd, and not likely to change. The niche markets, sacd, records (vinyl to more modern types), are small, but seem to be holding steady. Sacd releases continue to grow, but are mostly all classical. The audio dvd stuff is having a hard time getting established. The new dual discs are the latest attempt, coming out in November just in time for that Christmas rush.