As ridiculous as this sounds, there's certainly historical precedence. After all who did Fred idolize? The Dodgers. And what did the Dodgers do? Moved out of NY.
So the better question is, if the Mets were to move to Montreal, which National League would jump at the chance to move into to the NY market? Which team would you want?
That said, I dont believe the Mets would move to Montreal in a billion years.
"Ain't got the call no more. Got a lot of sinful idears – but they seem kinda sensible...."