I think that back in the days before Freddie and Fannie, the rate of home ownership in the USA was below 20%. Within 20 years after Freddue and Fannie were started the rate was in the low 60%’s.
They are the single biggest factor and if they are seriously watered down, home ownership will probably go with them. The private sector will want a lot more from a potential home buyer. Cash will be king and those that need to sell their property will have to reduce their prices significantly!!