Who really knows what's going on inside MOL's head? For sure if he's going to start long haul he's do it out of Dublin where the APD is just €3-€5,using feed from all over Europe, but of course if this was a through ticket from the UK you would pay APD to the USA even going via Dublin, so i would guess he'll basically say book with us to the USA from Dublin and catch a flight to Dublin.
He will know soon enough if the low cost model long haul works with Norwegian set to start service from Oslo in a few months time, having said that Norwegians current product offering is much better than the minimal offering from Ryanair, Ryanair are safe, on time & cheap, but with zero customer care or service, which is fine for a quick blast to France or Spain, but I am not sure i would want 6 hours of scratch cards sales.