People will just buy a different smartphone if they're out of stock? Let alone if it's the iPhone they want? I don't believe it.
Even if they were potential iPhone 5 buyers, they either said: "Meh, not that great" or "Not great enough to bother waiting... 2 weeks". I guess I see a 2 week wait for a 104 week contract to not be a big deal...
The same would be true if iPhones were abundant and the Galaxy was out of stock, though Apple will always be at a disadvantage because there is only one "current" iPhone while there are any number of "new" Android phones the sales guy/gal could choose to push.
I am thinking of getting a galaxy because of the nonsense. The main reasoning for not doing so is the loss of my apps. 4 years of app purchases are effectively going to be wasted.
As for "Let alone if it's the iPhone that they want" Apple is the most recognizable brand and thus a higher portion of it's users are likely to be uninformed and persuadable.