There you go !
KEF as a hub, "Ryanair USA" (to be formed) flying in from all points USA and meeting up with Ryanair Europe, all points Europe. Bet it would be popular with our Irish American cousins ! The terminal could be fitted out with a "Dennys", "Irish Pubs" and a Shannon like duty free, along with USA immigration pre clearance, sounds like a winner to me.
Perhaps not