Canadian banks are in good shape though, they weathered the 2008 storm easily. Mortgages are limited to 25 years in Canada and you need some 20% down IIRC.
I do think there is a housing bubble, especially in Vancouver, but it's not clear to me how one could bet against it. And there always the chance that the prices are sustainable, they are positively mild compared to Zurich or Tokyo or San Francisco.