The availability of mortgage finance will fall. Less people will be able to buy a home and the values will fall, until they reach levels where they could afford them.
The ability to qualify for a home loan will be made more difficult, so obtaining a mortgage would be harder. This will mean less closings for real estate agents and sellers, and more work for less reward. Again this will impact everyone, from new home buyers to baby boomers moving out of homes to retirement villages, to wealth inherited. Expect Americans’ wealth to shrink over this.
Variable mortgage loans [called adjustable rate mortgages in the US] will mean that mortgage interest rates will fluctuate with the financial markets. The certainty of the 30 year mortgage will die, and so will a lot of people’s desire to own a home.
On top of that variable rate mortgages will not be government guaranteed and this means that the interest rates will be higher.
Canning the 30 year fixed rate mortgage. This will create uncertainty and loss of confidence in the value of homeownership in the US , is it weren’t damaged enough already.