As a layperson I have a feeling that's not going to happen. The working class has too much wealth tied up in their homes because US society and the government have encouraged people to treat it as a store of wealth instead of a box that shields them from the weather. People talk constantly about "getting on the property ladder", "buying more land because they aren't making more of it", "having a landlord side hustle", etc. A house is a lot more tangible than stocks so people without knowledge of finance feel much better about investing in one (understandably so - also forget about Social Security). Combine this with associated government tax subsidies and mortgage underwriting programs and you've basically created a situation where home prices can't do anything but go up.
Look at the amortization table for the proposed 50 year mortgage: borrowers wouldn't be making a dent in the principal for a good 10 or 15 years. The underlying assumption here is that people would make money via home price appreciation, i.e. speculation, not from creating an actual store of value. We already kicked this can once when the 30-year mortgage became a thing 60 years ago.
Of course one can't draw the current trend line into infinity because of affordability but I highly doubt it'll go down appreciably. I also don't know enough to have a solution to this problem - any ideas?