I would say there are more variables than just investors, speculators and flippers. all time low interest rate, less houses more buyer on the market, disposable income, fomo, keeping up with the jones, etc.
the only problem I see with raising the cap gains is that somehow the government would slide in a high cap gain for other assets as well (equities, selling company, metals, crypto, etc). I for one would have a huge problem with with higher gains on investments. but, the government is sneaky like that trying to slide in taxes that way.
Im looking into becoming a non tax resident and picking up and moving to another country. I see canada spiraling the drain and eating away at my nest egg.