And what makes you believe that it will be YYC winning the airport lottery?
Any decent train service will cut the time airport to airport to less than 2 hours with a stop in Red Deer. A High Speed with no stops perhaps a bit over an hour and 20 minutes if the speeds are comparable to Eurostar. Paris to Brussels is almost identical to YC and ED. The train eliminated air travel but it certainly didn't close or even reduce traffic at either except of course for the inter-city flights. The A380 was supposed to eliminate dozens of destinations through a hub and spoke operation with A319 sized a/c working the spokes for longer distances and High Speed Rail covering the 300 km or less routes. The whole idea fell through and the A380 ended up as a bespoke concept. Nobody wants to spend up to 3 hours getting to their flight unless they absolutely have to and that is what would happen if you closed either airport or went international only out of one or the other. The notion of consolidating flights looks good on paper but it doesn't work in real life.