Aside from global financial crises, what would be the catalyst to stop the bubble for the housing?
Again, this is said as the bubble for cryptocurrencies. But you have to look to the adoption rate and the fundamentals that are happening to bitcoin. With those things, that makes the value of bitcoin being higher and if it drops a bit, it will still recover quickly.
The bubble occurred, people dealt with it, and wise behavior will lead to a gradual decrease in prices, not a collapse of the bubble.
But as said, a bubble has to burst.