Bait and switch now? Regans relationship with Dulles is a good example of the volume and type of traffic the Pickering airport will be doing in it’s relationship with Pearson.
Washington is about the same population as the GTA.
One big difference, Washington has a lot better weather and more airports and runways today than Toronto will have in 10 years when Pickering opens. This includes BWI, Baltimore Washington airport, another pax jet airport that does about the same as Regan.
It also has a number of jet capability runways in its GA airports. All of these airports and infrastructure seems to work well within the confines of geography.