JC you say: "Vancouver has been more than 60% Asian for well over a decade."
That would mean back around 2005, correct?  Hmm..
Not according to Stats Can, JC.,  "43% per cent of Metro Vancouver residents have an Asian heritage." (As reported in Vancouver Sun, revised, Oct 31, 2016) Caucasians are still a majority in the Lower Mainland.   

Based on your, there must have been a pretty significant OUT-Migration...

But perhaps you mean the CITY of Vancouver (Population 603,000--about 25% of the entire Metro demographic.)   Stats Canada (2011) reveals the Asian population for Vancouver city is roughly 47%. Breakdown: 
    Chinese: 27.7%
    South Asian: 6%
    Filipino: 6%
    Southeast Asian: 3%
    Japanese: 1.7%
    Korean: 1.5%
   West Asian: 1.2%
TOTAL: 47.1%
 Source: World Population Review.

Again, it appears, based on your "more than 60%", that Asians have, in fact, been LEAVING the area "for well over a decade."

So, perhaps you might stop INFLATING the "problem."