There is no way that Aer Lingus will still have 3 daily (2 on SAT) by the end of next summer. I could see it being down to daily or 2 daily on some days
This dublin route will be 3x a day service because of the onward connection times to the US. Aer Lingus would be silly to reduce this service even if load factors are low to allow them to serve their US pax.
If anything my gut feeling is that you will see from next summer onwards the flight changing from an Aer Arann ATR72 to an Aer Lingus A320. EI will start off i feel with an ATR but then will see how it goes and change it accross to an A320. Its the only way I feel because of the allowences that certain pax get i.e business class pax can have 2 bags each weighing 23kg from what i have been told. So surely using the RE ATR will have and I have seen it myself significant space and weight issues?
I can see bags being left behind now before the service has begun.