Rich people do not pack up and leave in the absence of luxury housing. They settle for the next best unit, and then the people who would've booked that unit settle for their next best unit, and the shit continues rolling downhill. You have people spending thousands of dollars a month to live in Manhattan in buildings originally built as tenements.
And if a city cannot build as fast as people flowing into the city, then there will never be “housing left behind”.
GVRD/Metro Vancouver encompasses Vancouver and surrounding cities, as far east as Langley and Port Moody. The prices decrease quite a bit as you get further away from Downtown Vancouver and the city in general.
“Other cities” in my original comment meant these outlying ones, not ones outside of the GVRD. The prices in False Creek are going to be much higher than the GVRD average.