I voted for "drop m" but I add this: I use optical drives, I would be fine if they remove it from the MacBook and MacBook Pro, but the external drive should be free with every MacBook Pro and MacBook, they can even offer you a discount if you do not want it ($80 off your total price if you don't want the extra hardware, same price they are charging you now to get one with the MacBook Air)
I can see the reasons to remove it, but as many have pointed out, there are still a lot of reasons to have one. These notebook computers are pretty expensive, we should not have to pay extra to have an optical drive at a time where Apple sells so many products on DVD, not just 3rd party software like Microsoft's Office 2011, but Apple's own software like iWork and iLife which list "DVD drive required for installation." as a system requirement on their own website!
Apple should move to a purely download store for their software (They would still have to carry DVDs for other vendors for Adobe, Parallels, Office, etc. It's up to those companies to move away from optical media) before they totally eliminate the optical drive as part of the package (either built-in or a free external drive) for the notebook computers that are not "ultra portable"
The MacBook Air is not meant to be a primary computer, it's designed to be in an environment with other computers so that you can share their optical drives when you do need one. So I can see the external optical drive being an accessory for the MacBook Air, but not the MacBook Pro or the MacBook. Unless Apple just expects us all to have iMacs/Mac Pros in addition to our NoteBooks!