Yeah, saying Montrealers dont care about baseball and then pointing to attendence of the Expos towards the end is a weak argument because it ignores the context behind what happened. Expos basically had no owner after Bronfman, even when the Expos had a potential contender, its ownership consortium was so cheap, they wouldnt spend any money to keep a potential world series winning core around for even 1 more year.
When you have an ownership group who wont invest in the team, a stadium far away and crumbling and a losing team where even if you develop stars, they wont be retained, who would show up to a game?
To get high traffic, you need convenience (downtown location where you can easily get walk ins or people looking for an evening activity), a good atmosphere and committed ownership. Expos didnt have that and the Oakland Athletics currently don't either. Als fans are still there (evidenced by the attendance in their protest game), but they lack reasons to go.