As always, it depends. Retina displays are great for text but for photographers, unless you double the size of images on your website (which makes them more attractive targets for image theft), they look fuzzy compared with native resolution displays such as the Air.
That's not a great argument to hamstrung a new piece of hardware honestly.
All Retina is the future. The sooner we are there, the better.
Honestly - we already are there from Apple's perspective I'm sure.
They seemed to think the nTB MBP was a great "new Air". It's not. It misses so much of what has been great about the MBA.
Oh well..
We are just busy fantasizing here about something that won't ever happen sadly.
:-(