Bush took a very tiny step in that direction after a big 2nd term win and with a GOP Congress. They let him twist in the wind. I can't see any Congress allowing this to happen.
The absolute best solution is to allow people to opt out of Social Security with the provision that the same percentage of money is contributed by them and their employer into a retirement account that they can’t touch until a certain age.
...had the SS contributions been actually invested (the trust fund) instead of being SPENT, we would not be in the problem we are in. Interesting the Bush idea was what, to take a minuscule percentage of contributions and invest them, and the screaming from the leftists, drowned out reality, common sense, and the right thing to do.