I think there are misconceptions about a housing crash and what causes it. That seems strange, given many people in these forums actually lived through one. There is difference between living through something and understanding it. This is why people say "what goes up must come down" or "we are due for a crash". The fact that we had a major crash actually makes another crash LESS likely, not more likely. That is because economic events "thin the heard" and the weaker investors / businesses cease to exist. It also causes the "system" to heal in a way that resists another crash. Between 2008 and 2015, over 500 banks failed and the remaining banks were subject to new liquidity and lending standards. Something similar happened with home builders and developers. Many went out of business, but the remaining builders became more conservative. We were left with conservative lenders and lower new housing supply.
It is also worth considering that the word "crash" usually implies sudden, like a car crash. In the case of the housing crash, inventory started building late 2005 and didn't peak until 2009. Prices hit a peak in early 2007 and a bottom in 2009. Prices and inventory stayed low for another 2-3 years until we finally started seeing recovery. So this "crash" really started in 2005 and ended in 2012. In fact many markets were worse in 2010 or 2011 than they were in 2008 or 2009. This was really a slow moving event that had warnings and time for people to prepare. The problem is people ignore information that is counter their preferred narrative. If you are a house flipper, you want to believe that the market will keep going up. If you are an investor, you may want to believe a crash and buying opportunity is coming. The need to support your preferred narrative clouds reality.
In the end, there is only one thing that matters, which is supply versus demand. Demand is driven by people who want to live in a certain area, which is driven by the local environment, economy and employment. During a recession, housing inventory increases and prices flat line or even dip. When our economy contracts, our housing demand will contract. Just to clarify, contraction can be a slight pull back or flat line on prices for 12-24 months. That is not the same as a crash.
The trouble with waiting for a pull-back or crash is missed opportunity. You miss the ride up in prices and you miss benefits of holding the investment. The other problem is fear. The same fear that scares people out of an appreciating market, scares them out of a depreciating market.