Fractionally off topic...
I travelled to Mexico last month on Air Transat. They use an L-1011 that has a small business class cabin at the front. Apparently the only reason that they have not configured the whole aircraft for Y is that there are not enough exit doors to meet the requirements for the additional passenger numbers that would result from an all Y configuration.
They sell the larger seats up front for about a $50 to $80 premium, making very clear that all you get is a larger seat - in all other respects, the service is the same as the rest of the plane.
I think this is a great idea - getting a large seat for a very small price increment - I would be very happy if Air Canada offered this same choice on the routes where they only offer Y service with dual-class aircraft.