The hidden story here is what happens to the 13" Pro.…
A $1500-$1999 13" Macbook Pro with an Air-style SSD plus traditional hard drive, a discrete GPU made possible by dropping the optical drive, and a 1440x900 IPS display would probably sell pretty well.
Basically the 13" Pro either needs to become a serious high-end compact powerhouse or go away.
I agree with you very much, except to point out that it has always been this way.
Back in the PPC days, the 12" iBook was an arbitrarily crippled 12" PowerBook. They had the same motherboard, just running a 1.33 GHz chip instead of a 1.5. And it had a 4200 RPM drive and ComboDrive instead of the faster alternative, which could barely have been more expensive by that point in time. The iBook even lacked an audio in jack, even though the port was sitting right there on the logic board.
But in order to get those extra little goodies on the PowerBook, the price went from $1000 to $1500.
And when the unibody MacBook was introduced, it was better in most respects than the 13" MBP of the time.
So really, going "Air" on the consumer line, while retaining the GPU, full-power CPU, and spinning HDs on the Pro Line, is the first chance in, well, ever, to have a meaningful difference between the consumer and pro Apple notebooks.