It's not just the ipod's lead its the ipods innovation. In other articles on this topic they found that the ipod touch was a much bigger part of the product mix as people moved from the ipod classic/shuffle/nano to the touch.
Basically MS copied the ipod classic and instead of moving forward they seem to keep updating the 2003 version of the ipod with mild improvements. They offer a Zune pass where you can pay 15 dollars a month for music...on the ipod touch you can download Pandora, type in a song and get a custom radio station based on that song (along with 20,000 other aps of varying usefullness). The Ipod touch is heads and tails better then the ipod, and I already liked the ipod which I've had as far back as the 5GB mac only release model.
I'm sure next year there will be Zune touch if they keep at it, but by that time again Apple will have made something better and on and on it goes.
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