If Toronto built a district specifically for high end boutiques to set up shop, I'm sure they would show up in similar numbers as in Miami. It's true Miami receives several wealthy Latin American tourists, but Toronto not only has more local wealth, it receives far more high end tourism from China and the Middle East. Toronto's biggest problem isn't whether or not brands can be supported here - it's lack of adequate space. I think that point has been made a trillion times over now. Hence the fact that Yorkdale is attracting several high end brands ahead of Yorkville. I don't disagree with you that it would be preferable to have these stores open in Yorkville first, but any brand wanting to enter the market would rather get space in a high producing mall than sit on the sidelines indefinitely.
Time will tell if Miami can support all that luxury. My gut feel is probably not. You also have to consider if many of these stores are corporate or franchise. My suspicion is franchise. Toronto tends to be more of a corporate store market so it takes longer, as the brand itself is the one taking the risk, not the franchisee. Look at Russia - if I'm not mistaken, about 90% of all the luxury stores were operated by one or maybe two franchisees.
