In another thread I said there should be an option for those who buy a MacBook or MacBook Pro to be able to get it without an optical drive and get that $80 taken off the price of the notebook computer. This would be for people who know they don't want an external drive, they should not have to pay for something they won't use.
Also this was directed at the MacBook and MacBook Pro which currently can easily be someone's primary/only computer. I think as long as Apple sells DVDs, their "regular sized" notebooks should be able to read them without an additional accessory.
I see the MacBook Air as something that would be a secondary computer, something light for travel that is still very capable, but not really a main machine. I can understand the external Superdive being an accessory for the Air but not the Pro or white MacBook. They made it to be as light and thin as possible while still having excellent battery life, the removal of an optical drive is part of the total package.