It's unlikely YYZ will be more than a spoke beyond what it is today. It would seem Canada is a country that is limiting EKs service (for now) into and out of this country.
Better not tell the GTAA that given all the infrastructure improvements planned over the next few years...and the boasts of 480000 odd movements in years to come (425000 odd now).
Bit of a gap between what the GTAA wants and what the Canadian govt wants I think (and the airport rent argument is just the starters).