This.

The US housing market correction from 2006 was 30%. In this time, the US Fed funds rate went from 5.25% to 0.15% cutting banks' monthly cost for a $250k loan from >$1k/m to <$50/m.

In the meanwhile, median LTV has gone from 80% in 2007 to 95% in 2017 [1] and median loan sizes have gone from $175k to $325k. What happens when interest rates normalise and mortgage interest doubles?

The banks have been propped up but the risks have not left the system.

[1] https://www.urban.org/research/publication/housing-finance-g...