Fantasizing apart, if it happens it will be a Canadian team simply to maximize the TV market.
The Jets vs an American team brings in local markets and national markets only as far as each team is popular in their own countries. That is to say Detroit or Boston are far worth more than Minnesota.
Wpg vs Toronto, Montreal or Vancouver, would probably bring in the best Cdn numbers, but even against smaller markets like Edm, Cal. or Ottawa the game would probably do OK because of the novelty of outside games.