100% financing will never disappear.. it will just be MUCH harder to obtain and rates (risk premiums) will increase. There will ALWAYS be someone out there willing to take the risk, and there will ALWAYS be someone out there willing to pay for it.
What you probably won’t see is a huge secondary market for these things. More likely private lenders who keep the portfolio and service the loans themselves. It’s very lucrative.
Good times or bad times, people always need money.