This is never going to happen because the US Social Security system is almost entirely pay-as-you-go since current contributions fund the vast bulk of current p

This is never going to happen because the US Social Security system is almost entirely pay-as-you-go since current contributions fund the vast bulk of current payments. The social security fund is a bit of an accounting fiction since it is just one part of the government owing money to another part of the government. Even if it were practical though, how would you deal with those left destitute because of poor timing (retiring just after a market crash) or who just made poor investment decisions?