That is the idea yes. Over the long term everything converges to monthly payment. If someone has $1000 to spend on a house - they ultimately don't care if its a $300,000 house with a 2% APR loan, or a $200,000 house with a 10% APR loan (math made up and not exactly correct).

The problem is people are very very happy when they can make some cash off a move. People are very very sad when they are underwater. To all the people that paid $250-$275k for the house above? They are going to delay for a very long time before they sell for 200k. Likely long enough that inflation will slowly bring up the value.

People are very emotional about this and do not make wise economic decisions. For example - the finances of the time may mean that the house they are both selling and buying are 30% down. But it's a real feel bad, and losing money in a house is enough to stop many people from moving. a 30% gain where the seller both makes money on their sale AND ends up paying way more in total? It feels good and people jump on that instantly. (And the way down payments work, its generally easier for someone with limited liquid assets to to the sell + buy when the market is up 30%, vs when the market is down 30%).