You're saying that USB is a good substitute for Firewire 800 when connecting to external storage? I wasn't even talking about target disk mode or firewire videocams. I was just talking about the inadequacy of USB.
IMHO, the biggest deficiency of the current MBAs is that they have very limited storage capacity and no Firewire port for reasonable external storage access.
I'm saying that USB is a substitute that most consumers are okay with. Frankly, I wouldn't have a Mac without a FireWire port, but that's just me. I ask many of the users I support if they'd miss the FireWire port and their response every time is "what's that?". Their loss, I say.