Whether it is financially sound is another matter. Yea, this is a big cause of the current 'problem'. It's not so much that people cannot pay off their mortgag

Whether it is financially sound is another matter. Yea, this is a big cause of the current 'problem'. It's not so much that people cannot pay off their mortgage in 30ish years, it's that the current financial climate heavily disincentives people from doing so.