A reverse mortgage is based on equity. If there was equity, then the banks wouldn’t have exposure.
If you are proposing that the banks own the proerties, and the former owners are legaly required to rent from them and pay them as much as they can, then you are advocating a system similar to middle ages serfsom to the banks.
How about we stick with are current system. If you can’t make your payments you default. If the bank made injudicious loans that fail, they take losses.