Growing up in Nova Scotia, MLB was widely followed. Loyalty was split between the Red Sox, Expos, and Jays. With the demise of the Expos, people gravitated to the Jays with the Sox a distant 2nd.
On a trip out West last August/September, Jays fever was palpable. The Blue Jays can claim to be Canada's team imo. That said, I would like to see MLB in both Montreal and Vancouver within the next 10-15 years.
On a side note, with 48,000 in attendance at Skydome today the Jays have surely moved passed the San Francisco Giants to register the 3rd highest average attendance in MLB behind the LA Dodgers and St. Louis Cardinals.
http://www.espn.com/mlb/attendance