I have a different take. Even with the high prices of today's homes, chances are they will be much higher in 50 years.
The only real way out of the money trap these days is to load up on debt and invest into assets/stocks that can outperform said debt.
A 50 year mortgage is about as loaded as you can get, debt-wise.
So, in 20 years, as long as you can afford the monthly payment (and maintenance) there's a decent chance that new home owners may have amazing appreciation.
