if this is your perspective either your husband hasn’t communicated very well or he became a lawyer because economics wasn’t his strength.
If there is/was a house price crash that would be happening because either people were losing their jobs through economic downturn (this would be affecting those waiting to get on the housing ladder as well and probably disproportionately who would not be able to get on the housing ladder then anyway) the double whammy of this would by BTL investors selling up meaning less rental properties meaning shortages.
interest rates shooting up, basically has he same effect as above.
Both the above would mean much less money sloshing round the economy, likely to affect hospitality and retail most, again leading to job losses then not being able to afford a house.
many would be in negative equity which would dent their feeling of economic well-being and again this would severely affect the economy.
a house price crash (if it happened) is really not good news for anyone except rich cash buyers and then after a few years or dip the problem is likely to come back even worse.
all the above is just the tip of the iceberg