so you base your assumptions on the future just on what you think people think and will do, and not on what was done in the past or historicly?
if you are going to assume the future to what you want it to be, you cant really argue it one way or another.
people dont max themselves out on a mortgage if they dont have to, if they can get the house they want, without maxing themselves out, then they live comfortably and can afford luxuries.
people only max themselves out when they have to in order to get the basic house.
you really need to look at history to speculate the future.