Fundamental flaw in late *2009* MacBook (edit, I meant 2009, the new white one)
Any marketing guru will tell you “luxurious” features, extra gadgets, tricks, techno buzzwords that will get people to open their wallets, even if not all of them will learn how to make use of those “goodies”.
By extension you have bragging rights of those extra features. The limitation of USB2 are becoming more and more known, and performance minded consumers are purchasing FireWire 1394 and/or eSATA storage over USB2 despite the higher premium, and there is very good selection of FW supported external drives on the market.
Microsoft finally addressed the FW failures in Vista with Windows7, so that market will at least be maintained.
http://www.istockanalyst.com/article/viewiStockNews/articleid/3585606
Just like a Mercedes or Lexus, people spend more $$ for extras that they may never use, but can brag about.
Otherwise, the MB is functionally identical to the plethora of $499 laptops out there, some of which DO have 1394 (and can be hacked to run OS X).
(I estimate it costs <$30 for the hardware, maybe <$23 with volume pricing of components.)

EDIT:
in response to next post:
The flaw is reducing both the methods and speed of data transfer from the MacBook.
FW800 is by far the fastest transfer method compared to Giganet, USB2, Wi-Fi, BT, or optical.
While there are those who do not use/need FW, there will be potential customers that do need that feature.
And you lose the very useful feature of Target Disk Mode.
In short, Apple cripples transfer ability and speed, alienates customers, and kills a servicing tool used since 1992 (as the "SCSI Disk Mode" in early PowerBooks, the ability now using FireWire instead of SCSI)
Any marketing guru will tell you “luxurious” features, extra gadgets, tricks, techno buzzwords that will get people to open their wallets, even if not all of them will learn how to make use of those “goodies”.
By extension you have bragging rights of those extra features. The limitation of USB2 are becoming more and more known, and performance minded consumers are purchasing FireWire 1394 and/or eSATA storage over USB2 despite the higher premium, and there is very good selection of FW supported external drives on the market.
Microsoft finally addressed the FW failures in Vista with Windows7, so that market will at least be maintained.
http://www.istockanalyst.com/article/viewiStockNews/articleid/3585606
Just like a Mercedes or Lexus, people spend more $$ for extras that they may never use, but can brag about.
Otherwise, the MB is functionally identical to the plethora of $499 laptops out there, some of which DO have 1394 (and can be hacked to run OS X).
(I estimate it costs <$30 for the hardware, maybe <$23 with volume pricing of components.)

EDIT:
in response to next post:
And what is the fundamental flaw ? Somehow, it seems you have forgotten to state it after your rant about FW being sooooo good.
I'd rather have network attached storage than FW or USB storage anyhow. Most homes now have more than 1 computer, and local storage is becoming more and more of an issue rather than a solution.
The flaw is reducing both the methods and speed of data transfer from the MacBook.
FW800 is by far the fastest transfer method compared to Giganet, USB2, Wi-Fi, BT, or optical.
While there are those who do not use/need FW, there will be potential customers that do need that feature.
And you lose the very useful feature of Target Disk Mode.
In short, Apple cripples transfer ability and speed, alienates customers, and kills a servicing tool used since 1992 (as the "SCSI Disk Mode" in early PowerBooks, the ability now using FireWire instead of SCSI)