I don't get it, really. This argument has been worn out. But if you're using a FW drive (or really any FW device), are you really using a mobile computer for its mobility? And if you're doing those things on a daily basis...you're not going to buy a macbook.
Actually, you are wrong. Often, I find myself working on a location doing instant edits, downloads etc. I need BOTH portability and FW. I need to edit things on a run on location, I'm not going to be dragging along a desktop. The other thing is when I'm showing something for a client - I just throw an external HDD into my bag, no problem. But I need FW. Another example: a good friend of mine is a DJ - he needs a laptop with FW for his gigs.
Here's where you are right - one needs a MBP in this situation... but errr... that was my point to the OP! If he wants to do audio work and film editing, he should be aware that MB is not the way to go - MBP is more suitable.
What burns a lot of people though is this: the MBP is a cow. If you wanted something the size of the MB with FW, YOU NO LONGER HAVE THAT OPTION!!! It used to be that in the old MB (previous models) you had FW on all of them. That's no longer true. THAT'S what's different from the past. THAT's where Apple dropped the ball. They removed an option that existed before - and left NO option for the professional who needs to travel light. I used to have an option before. Now I don't - it's MBP or nothing. What if I think the MBP is too big/heavy? I can get a previous model MB - nothing CURRENT in Apple's line up fits that niche.
Sure, you may say, Apple can go ahead and screw their customers, because only a minority use the FW this way. Thing is, things don't break like that, but numbers alone. Yes, it may make only a small difference in the bottom line... for a while. However, this is a very influential minority - the trendsetters, the evangelists, the high profile users, the PR boon for Apple. Apple always were strong in the creative fields users. That was worth FAR more than the small amount of $ to their bottom line - it was priceless PR. You saw a famous designer, director, musician etc. using an Apple - wow, that's worth a fortune in PR and advertising. If these people go away, your cache goes away. And eventually that has a devastating effect on the bottom line.
That's why I think it's a mistake to kick the creatives in the teeth as Apple is doing with utter contempt. It'll backfire. Just watch. I already know of several of my friends who are looking to alternatives - and they were going to buy new gear. Laugh now, we'll see who is right down the road.