True, and it's a real problem, imo. I love Apple, but quality has really taken a hit because of them. iTunes is the reason SACD failed, and blu-ray won't be developed nearly to the point it would have if movie downloads take off. It's a weird irony, because Apple always meant quality, at least to me.
iTunes was NOT the reason SACD failed. MP3's and downloading were already big before iTunes. The iTunes Music Store was launched 4 years after the introduction of SACD, and then it was Mac only for a time.
Besides MP3's, SACD failed because most people didn't want to replace CD's and buy new CD players (the quality wasn't that much better to the average joe with an inexpensive system). On top of that, there was a competing format, DVD-Audio. Sound familiar? Kind of like how many people (even folks with HDTV's) don't really care to replace their DVD players, and were confused by two competing HD formats.
In any case, I'm happy that Blu-Ray won. Still a bit expensive for me, but now prices will go down quicker!