Earlier this year Apple increased the price of songs from three major labels (Sony BMG, Warner & Universal.) If ASCAP & BMI have their way, prices may be going up regardless on what label the song is from. The two associations are looking to congress to make it mandatory that anyone who sells a download must pay performance fees. The two organizations are also looking to bank off of movie & television downloads as well as still trying to bank off of the 30 second samples that iTunes allows for.
I think if this were to happen, it could come back to hurt iTunes. In the article it states that after the price increase earlier this year, sales dropped noticiably in the following weeks. So if it dropped after a slight price increase, just imagine how much more they would drop after a bigger price increase. At the end of it all, I think it comes down to how much the consumer is willing to put up with, because if they aren't...It'll be a not so bright future for iTunes.