Dublin has connectivity to all major European hubs, and has twice daily flights to Abu Dhabi and Dubai using 3 777's and 1 A330-200. In my mind, Shannon would have a market for dubai or even Abu Dhabi.
Carriers have significant presence at Dublin as Dublin serves the entire country. Ireland is a really a small country after all. It should also be noted that those 3 777s and A330 every day don't carry just people, they have cargo from the entire country loaded in their bellies, transported from all across the country's well-developed road transport network. So, in essence, the Shannon region is already well-served.
I know countless people who either drive to Dublin, or connect in Heathrow to get to Australia.
How many are these people travel in J or F class? Emirates A330s, for example, have 12 First Class seats and 42 in Business Class. Do you really see F demand from SNN?
How do you know Paris doesn't work? Do you have special figures, market research or wisdom that we do not have?
CDG has always been cut by the carriers which tried it? Is that not enough evidence ?? lol
There certainly is a market for such traffic ex SNN, but it is relatively small and currently well served by DUB flights. IMO here more likely lies an opportunity for TK than for EK/EY. TK, with their more suitably-sized aircraft and the opportunities to connect to sun holiday destinations in Turkey and Egypt, would seem to be a more realistic prospect for SNN.