To all the recent posts, re Cork and indeed Belfast justification for transatlantic service, the issue is not that anyone is denying these could be successful. Dublin as a hub is a much better investment for EI not only does it offer good connectivity but it can support the EI network across Europe , hence leaving EI less dependent on the point to point traffic.
This scenario where what may seem like credible routes and often routes that once were successful eg Belfast Toronto, don't get another chance is a component of today's reducing number of airlines. Fewer airlines chasing better returns become extremely selective where they invest their assets. Profitable is not enough, it's about what market can deliver the most return ...