On a mac, both people have to be in the AirDrop view on Finder. This helps limit the amount of people that you end up seeing. I think cmChimera is saying that you forgot to show how exactly that part of AirDrop would work on iOS. What would the other iPhone/iPad have to do to get the file or be noticed.
As for the concept, I always envisioned Apple simply using the share-sheet menu that they introduced on iOS 6.