I have read this entire thread and have been somewhat surprised at the strength of the feelings expressed on the matter.
Having said that, I must admit I have enjoyed the experience of a backlit keyboard both in my two and a half year old MBP, and my very recently bought (just before the update) Rev C (SSD) MBA.
FWIW, I spent the past two years in the Caucasus, working in a Windows environment, a place where electricity was erratic at times, and internet access also somewhat sporadic. Thus, a backlit keyboard became more than an added pleasure, indeed was something of a much missed necessity. Actually, I have to say that I greatly missed the sheer convenience of a backlit keyboard on the official computers assigned for work purposes when working in these conditions. So, I'm a fan of the backlit keyboard and hope Apple think of restoring it in an updated version of the MBA lineup.
Cheers
Cheers