Chile replaced their version (used Chicago school trained economists and advice!), much smaller scale but probably worth studying.
I think the best that could be done is new 18 year olds Can transition to a 401(k) type deal but the problem is that they already have the retirement in a 401(k) with a job so there’s really no guarantee that they’ll have money at the end of the day for retirement either. I’m glad I’m in my 50’s. These next generations are so screwed. I feel for my kids and even more so my grandkids.