For many people, the MacBook is still better than base 11" MBA for getting their (school?) work done.
It has a bigger screeen (not everyone wants to stare at 11" for hours on end), comes with hard-drive for more storage (this is a big one), comes with optical drive, it's white, it's pretty solid.
I don't disagree with the fact that many people might prefer the current MB. But the trends point in a different direction. Stronger body construction, portability are becoming more and more important. SSD is becoming more important. CDs are going out of style. iCloud will give us more off site storage. This is a big disappointment of mine. I was hoping I can just keep all my music, movies/videos, pictures, documents, books up there, but it does not seem to be the case at launch. But imagine if you could. Wouldn't 32GB be enough on site? Storing non-immediately needed stuff in the cloud is where we are heading.
Now consider who is running the company. Didn't Steve Jobs tell people based on less compelling reasons that you actually do not need something (like a CD, hard drive or a bigger screen).
Besides, if you want a CD, buy one. If you want a bigger screen the Air and 13" Pro is not much more expensive. And if you want more storage, iCloud will sell you an upgrade for the low price of... by the way, have you heard of our Matching service?
Not to mention I am sure Apple just loves dealing with another manufacturing process (that they really should not have to). Haven't you heard they just recalled a bunch of plastic MB parts? Not to mention, how many people are rubbing their hands saying, as soon as that next plastic thing comes out, I'll upgrade. Everyone is salivating over the aluminium products, even if they cannot afford it. But if an extra $200 causes a problem for you, you will 1, buy refurbs (if you know of them), 2, keep what you have longer and 3, buy whatever they offer at the lowest price point.
With all due respect to your specific preferences (which are very legitimate), you are in the minority and there is no reason to keep the MB alive from a technology, vision and business perspective. I'd like to hear your thoughts based on these arguments.