Firewire is important for video. I'm glad Apple has now embraced USB2 - it was stupid not having it on Macs prior to September 2003 just because they wanted us to use Firewire instead (because Apple invented FW).
iPods I can understand - PC manufacturers are not embracing Firewire to the extent that it's on every computer but USB2 is standard on every computer now so it makes sense not to hold the iPod back over that. iPods mean more to Apple than Firewire and including both adaptors is an unnessecary expense.