iPhone Air is a sleek & general-purpose phone, but I doubt it will be so popular with this price point. Instead people may still opt for the regular 17.I have a suspicion that the air will be the most popular model for the general population. It will have the best shelf appeal for anyone visiting an Apple Store, and maybe be a conversation starter around the office etc.
MacRumor forum lurkers are inherently enthusiasts who will likely want the biggest baddest phone with the least compromises