Did they ever fly to Toronto?
I thought Montreal was the only destination they had ever served.
Where it might make sense is if combined with a US West Coast route so that they would be less restricted by aircraft type and load. But they're not going to pick up many passengers in Toronto and with the competitition to Toronto, it will be challenging for the Dublin-Toronto part, so it would seem a strange choice.
In some ways, if returning to Canada, Montreal might make more sense.