The problem with the real estate market is that housing isn't used as homes for people, but as investments for the wealthy. Occupancy is not required, but people still need places to live. That pushes people with moderate incomes looking for a place to live into cooler markets, putting pressure and competition on those markets driving up prices and attracting investors.
What is the underlying benefit of owning real estate that entices investors? They'll want to cash in eventually. Right now they can rely on other investors but at some point it's the desirability of living space that underpins it all. Who's going to be willing to buy when a huge return isn't guaranteed?
The city of Vancouver is hollowing out. The provincial government is cutting funding to schools in Vancouver because there aren't enough children. Meanwhile they can't build schools fast enough in Surrey. To put an optimistic spin on it, Vancouver is simply losing it's economic and demographic centrality. Suburbs that were once distance and quiet bedroom communities and growing fast and those other municipalities are becoming their own city centres. While Vancouver faces a demographic collapse, Surrey, Coquitlam, Langley and soon once small towns out in the valley cash in.