The large disparity between local incomes and housing prices is a major reason why there is so much attention on the implications of foreign capital on Vancouver's housing market. It seems like there hasn't been as much concern or interest in Toronto, but there probably should be.
[1] http://www.theglobeandmail.com/real-estate/for-vancouver-hou...
http://www.theglobeandmail.com/real-estate/vancouver/out-of-...
http://www.theglobeandmail.com/real-estate/vancouver/canadia...
http://news.nationalpost.com/news/canada/chinese-police-run-...
It's just like the market collapse back in the late 80's when interest rates climbed into the double-digits; no discretionary seller wants to lower their price from $1.3 million when that was a feasible offer 2 months ago, but no one wants (or rather no one is left) to offer that price. The market just seizes and eventually non-discretionary sellers are left to define the market.
It won't make any difference at all to the dozen or so billionaires who are looking to buy their Nth house in Vancouver. But it has devastated the detached housing market below $5 million here and that will ultimately put pressure on condos and townhouses. I think the only reason it's working is that TO and Seattle don't have a similar tax; Vancouver has made itself less attractive, but only marginally so.