Agree with River Joint on this.
For those of us who have to work for a living and fund the transatlantic flights (i.e. not cheapest economy tickets), the last thing we need is another link in the chain to go wrong. Many of us are connecting to other US airports to end up in out of the way places where businesses are located all over the USA. So the key factor is travel time, availability of connections, availiability of business services at airports etc.
It's not uncommon to rack up a 15-20 hour 'door to door' journey time each way. This generally has to be done at the beginning and end of a working week. No one in this position and in their right mind would add another night or additional connection to the equation.
When planning new USA routes and connections airlines don't even consider the economy revenue and everything is based upon premium traffic. I just can't see Aer Arran laying on flights in the morning specifically to feed into the transatlantic market from Dublin.