If they get to the point of going into a store, you can bet that the store employees will do everything they can to sell them a different phone that is in stock today, that they can earn a commission on now.

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.