I don’t necessarily think the low price would stop Apple from offering it as an option.  On the 14” MacBook Pro it’s only $135.
I’d say two factors come into play.
Would this sell to the consumer that buys the Air?  Do most college students and people browsing the web really care about a nano texture display?
Also, I suspect the Air gets a bit rougher handling than the Pro.  Is the nano texture display more vulnerable to damage?  If you have a bunch of people with damaged displays, they’re not going to be happy and this is not good for Apple.
I personally would never buy this because I prefer a glossy display.  This is one reason I like Apple computers over most Windows laptops. I don’t think I’ve ever seen a glossy display on a Windows computer.