Vancouver is actually one of the poorest large cities in Canada. Average income in Vancouver proper in 2009 was $43,911. https://www.biv.com/article/2014/9/trick-or-treating-planner...
All this means that Vancouver is the 2nd most unaffordable housing market in the world (after Hong Kong) http://www.theglobeandmail.com/news/british-columbia/only-ho....
Accordingly a housing is already so inflated that a 10% drop means nothing. Even a 20% drop wouldn't make things affordable.