Applying technological solutions to social problems hasn't worked a single time before, but SURELY it'll work this time
You can't make it impossible, but you can make it very difficult.
My elderly uncle almost gave $10,000 to a scammer who had convinced him that his nephew was sitting in a jail and needed this money to be paid for his bail. Luckily, he reached out to me for help and I was able to confirm that his nephew was at home, not in jail.
I honestly can't imagine some of the scams that are coming, particularly to the tech-vulnerable, if we don't do SOMETHING to make real-time deepfake video harder than it now is.