I can argue both sides of this, annoyingly. I am sitting here with an Air 13". I love everything about it except the screen. But if it got upgraded to retina it would become 1) more expensive, 2) too similar to MBP which would sort of contradict the whole point of Air. If it doesn't get upgraded it will continue sticking out like a sore thumb among the (admittedly messy) line-up, especially since it's called Air but thicker and heavier than rMB. I love the form factor, keyboard, connectivity options, but I wish I could upgrade the screen somehow. I prefer the tapered design because I can type while it's in my lap without cutting my wrists a la MBP. So in a way at the moment there is no Macbook that would satisfy all my desires.You mean other than price point, size, and options that it currently offers which no other Mac laptop offers? Other than those?
Maybe it's time to kill off the 13" and update 11" with retina screen, then call it Macbook SE.