Its like this I guess.
I've been into about 50-60 homes in relation to my job working in cable installation.
About 20 of those people actually have a stereo system to go with their TV.
About 14 of those people actually had it hooked up properly. (I fixed the other 6 for free, im so nice)
About 12 of those 20 people had more than 2 speakers.
About 5 of those 12 actually had them set up in aproximately the right locations.
Finally only 3 of the final 5 actually had a setup which was good enough to actually get anything out of their surround sound setup.
So whats that? 3 out of 50-60 homes had a setup that could even take advantage of 5.1 sound.