MCO/ or DXB
Australia is pretty well served via LON/FRA/CDG/AMS/ the US, and never mind EY's operation via AUH. MCO is slimmed down for the winter. But given the turmoil in the likes of Egypt and how it's perceived by the public, sun spots for winter such as MCO may stay busier than expected.
If EI were to offer a 1 stop alternative with QF I would have suspected West Coast US and connect from there. Also keeps the contingent of US Companies operating in Ireland happy.
But then you never know!
Regards
Shamrogue