Incidentally, I should clarify that I do not agree with the premise state in the title of this thread. Many Canadians do care about the CFL, and the league is quite healthy.
It is considered second rate, specifically, in Toronto, because that market is different from other markets. Toronto has top league baseball, hockey, and basketball. The expectations there are significantly different from markets that have only top flight hockey (most CFL markets) or not even that (Saskatchewan and Hamilton.)
Back in the day a famed Toronto sportswriter said the death of the Toronto Argonauts wouldn’t be the NFL coming to town; the death of the Argos was Major League Baseball coming to town. When Canadian cities had just the CFL, it was the pro sport, and if/when they had hockey too, well, hockey is kind of considered a Canadian birthright. But when Major League Baseball came to Montreal and Toronto, suddenly things changed. Those markets were now in a different league, both literally a figuratively; they were a true part of the American professional sports market. Things didn’t work out in Montreal because the team was poorly owned, but they flourished in Toronto and then Toronto got an NBA team, which has flourished and just made the CFL look even more bush league.
So now Toronto is kind of a four sport city, except it’s not, because if you go to a baseball, hockey or basketball game you are seeing the greatest players in the world at those sports. Literal Hall of Famers have played for Toronto franchises, and visit it to play games. But if you go to a football game, you’re watching the guys who weren’t good enough to get drafted to the NFL or got drafted sixth and were then cut from the practice squad. It’s a good league and a fun game, but it’s not the big leagues and is visibly not even close. It’s very hard to get fans used to being fans of the biggest league in a particular sport to care about a second tier league.
Consequently, what a lot of Toronto football fans want is the NFL, because they simply perceive that that’s the comparable product to the other leagues and that Toronto is a large enough market to merit it. The NFL has no expansion plans and an unwritten non-interference understanding with the CFL, and the billionaire likeliest to buy/move a team is dead now, so it’s not happening anytime soon. The plans for the Bills to move to Toronto are dead; no matter how you slice it, you need an owner who can get the city to build a $1 billion stadium and there isn’t anyone willing to do that here. Consequently, fans here grab an NFL team and cheer for it.
The Argos’ “decision” (they had little choice) to move to smaller BMO Field will work out very well for them. It’ll vastly improve the atmosphere of the games.