No, I don’t think it will have a big effect on Toronto YYZ, Vancouver YVR & Montreal YUL Canada’s 3 busiest airports✅.
Although I could see (some US🇺🇸 flight ✈️ cuts) quietly by airlines at medium & smaller sized airports in Canada 🇨🇦 like : Calgary YYC , Edmonton YEG , Winnipeg YWG, Ottawa YOW...