Compare the data in the article I posted to the reporting in the article we are commenting on, which asserts that the young people are staying. While the declines are not massive, they are increasing - and it represents a trend in the opposite direction of what this region has generally experienced.

This article is not particularly substantive, but does capture the zeitgeist of Vancouverites aged from their mid-20s to early 40s.
http://www.metronews.ca/news/vancouver/2016/07/14/60-percent-of-vancouver-families-plan-to-leave-city.html

And since this article trades in anecdotes, here is mine: you reference health care facilities. If you speak with young people working in the health care sector, young doctors are increasingly less inclined to come here/ stay here. If you speak with senior leadership at these facilities, in more candid moments, they will speak plainly about growing recruitment challenges here (I know because I have). It's a problem.