Is Apple's Dominance Sustainable

Guardian: Apparently, Adam Vaughan doesn't think so...Even though more than 16m iPods have been sold worldwide, he writes that the domination of the white icon is under threat by rival MP3 players, mobile phones and even Apple itself...(I don't really agree, but he makes a few good points to support his view.) "Long ago, the iPod became the generic 'Hoover' of the MP3 world, and now it has become an issue of critical mass" but I wouldn't  count on Apple's reign to end anytime soon...