Agreed - the Federal/Ontario/Toronto vacant home tax, if implemented, is a step in the right direction but it seems to be undergoing rounds and rounds of consultation. People complain about it, but the tax is reducing a specific negative externality - reduce hoarding/vacancy of a scarce supply (rental or for ownership/living) critical to a city's growth. Not saying Vancouver's right since a lot of people complain about their tax too, but their 1.25%p.a. tax on empty homes has incentivised owners to rent them out (or for those that don't, provide tax revenues to hopefully help deal with the problem).
And to be clear, I'm not singling out China - just that Westbank historically focused on that market. I know it's a global issue and know many working in NY, San Fran, London, etc. buying up properties here too as their earning power is so much higher outside Canada (both in absolute amount earned, as well as the benefit of a stronger USD/GBP).