There is a tremendous amount of cargo that gets moved with passenger planes today. Separating out that cargo is possible, but it may be problematic if you were to start splitting that cargo into two different airports. I agree with Mark that looking at moving cargo to other airports, other regional airports or other areas is certainly a solution well worth examining.
Today, of course, the economic hub is in southern Ontario. The economic hub centres around the city of Toronto. You can look at the number of companies that have located around the airport, and the number of freight forwarders and transport truck companies that have located around the airport. It certainly would be a long-term strategy to assist them to move to other areas in order to accommodate that request.