I don't know what hope it has. Can anybody from Montreal explain why they decided to build this airport where they did?
I could have seen Montreal building a big airport like that if they were actually planning to replace Dorval, but to build a competing airport that far from the city, I just don't get it. My map shows it to be over 30 miles from downtown!
I suppose that if Dorval is full of passenger planes and cargo ops are severely restricted, then Mirabel might be a possibility. But think how much extra money all the shippers will have to spend on fuel for their trucks as well as all the extra worker hours lost driving the extra distance many times each day, and you can see why Mirabel doesn't make sense -- for Montreal anyway.
Maybe Quebec could build a big new city out there and then Mirabel could be their airport? It would probably be the first time a city was started just to give business to an airport