Yeah, I will be hitting a road block in the future when my Mac dies and I have to buy a new one without a disc drive...burning CDs is very important to me for iTunes music, etc. I hope they still have the SuperDrive available in the future for the minority that wants to be able to use/burn discs.
You can buy one today to sit next to your Air. Or, you can look into why "burning CDs is very important to" you. Presumably, it's not the intrinsic thrill of causing a phase transition in a layer of dye sandwiched between two plastic disks ... maybe you should be planning on upgrading something else before you upgrade your Mac?
In my experience, notebook-size optical drives are one of the most fragile components in Macs. My wife's MacBook Pro lost its optical drive twice in two years, and right now my iMac from Spring 2010 is sitting without the ability to read a DVD from its optical drive.
I'm personally not bemoaning the death of the optical drive. I'll buy a little $50 USB drive that can more easily be swapped out when it goes on the fritz for those ever-more-rare occasions when an optical drive is necessary.