I would gladly opt out of Medicare and social security if it meant I could stop paying those two specific taxes. That money would be better spent in investment instruments than in the slush funds our politicians are raiding.
I think they should stop social security with this years 18 year olds. Let them do their own investing. Also sunset Medicare in 2071. That’s totally fair as the birth year 2006 and beyond will have plenty of time to save.