I don't care about the FireWire, but it would be more useful with one FW and one USB 2.0 than two USB 2.0. Now, I would prefer one USB 3.0 to any other combination myself. Add in two USB 3.0, and I guess I wouldn't notice any difference myself. As I would rarely use the one USB port, but when I do it would be something that the speed of 3.0 would benefit my use.
However, I don't believe anyone will be happy with the ports today. Two USB 2.0 is about as pointless as one USB 2.0. We all want USB 3.0. The others want a FW port too, and Apple has eliminated that from the future consumer peripherals. It used to be you could buy an iPod that used FW, now FW is gone from everything Apple sells (except as a port). So there's really no reason for Apple to provide the ports anymore other than backwards compatibility, and Pros want those usually. I would guess that 95% of non-pros don't care about FW, but I am sure someone will call me a bully or ignorant for making such a statement. Heck, it's just a guesstimate not an official research study.
I say bring on USB 3.0, and there will be a lot of happy people.