Here's my take, which I believe to be very Apple-like:
Consolidate the MBA to a single product, a 13" redesign:
Same size as 11" MBA, but 13.0" screen (the 13.3" rMBP is barely bigger)
13" screen at a smaller form-factor and lighter weight (900 grams, so even lighter than 11").
Keep the price at $999, and rMBP at $1299
Now you have a fantastic entry level Mac (13" like the old ones) at $999 and a higher grade Pro one for those who need better specs, at the cost of weight.
As for the redesign it'd be pretty much the same except IPS screen, smaller bezel(maybe like the rMBP) and little changes here and there(iPad mini like slate colour?).
Obviously the $999 version would be pretty limited hardware wise (64GB SSD, 4GB ram, lower clocked processor). There'd be an intermediate version at $1299 with double the SSD, RAM and a better processor(i7) for those who want great specs and great portability.
I wish it were true, but that sounds way too optimistic. It's very unlikely for Apple to push through these major changes right now. I think all that will happen is Haswell in the air; possibly remove the entry 13''MBP so that people can only choose 13rMBP or MBA. And then another long wait begins for an actual substantial upgrade.
That, to me, sounds very "Apple-like" nowadays.