It's not the ipod Steven discourages...it's the people that don't fully digest any of their music. The ipod is good symbolism of this because of the "Ipod Shuffle" and the robot-like mentality that results from this. Also related to that, it symbolizes the download culture, where full cds (or even just single songs) are downloaded to just be background music and not fully enjoyed. It's more of a fashion statement/youth rite of passage to listen to certain stuff nowadays.
The ipod is a fantastic thing, and anyone who appreciates music could see that. You could walk around with millions of songs in your pocket for god sakes. Imagine telling people about that in the 70's! The problem, and one where Steven seems very outspoken about, is the new generation of kids who are soulless (for lack of a better term). If you are in an Opeth forum, I suspect you have nothing to worry about.