Housing stock is not growing at 3x
Building more housing should lower the effective price of it, and allow many new home buyers or renters to enter the market.
[1]: https://www.pewresearch.org/fact-tank/2020/09/04/a-majority-...
It'll be interesting to see how things play out. I think the shift of older millennials out of cities combined with the relatively smaller generation replacing them will likely cause a reversal of a lot of the urban price growth in the past decade in places like New York. Rents are already reflecting that, but sales prices have more hysteresis.
source: 15 year professional Urban Planner in California