Won’t matter. See post #1.
The data is here.
https://www.ssa.gov/oact/STATS/table4a3.html
Honestly keeping SS Income “Taxes” equal to “Benifitis” and not allowing a trust fund to be raided seems to make more sence. Yearly adjustments based on Income would be tightly coupled with income of the first 400,000 for the rest of the population. That would be a 7% increase next year. That lag is just a fact of life, we all deal with that gap.
At age 50, and 12% of my gross income, I could have already set aside 3 million dollars and SS payments. I will make 4 million at age 65 with a much higher savings rate at the end of my working life at zero change in my lifestyle.
Taxes on 20 year olds are regressive. Taxes on 50 year old are for the better part ignorable by the general population. The happiest check is retirement savings, the worse is the amount that goes to other people not to work at the same level I did for a lifetime.