You didn't even begin to address my question, you just threw out a bunch of hand-wavey silliness about how "ownership" and "assets" makes everything ok.
What happens to the prices of those assets when the baby boomers retire and are pulling out more money than there are young workers putting in? You have the same problems as SS. What if we had all of that SS money in the market? It'd be a disaster.
The whole world didn't have a baby boom at the same time.
WRT companies that produce stuff, the critical time is not when boomers retire, it's when they stop spending money. Fortunately, many will stop when they die, which reduces demand and the "load" on both the stock market and SS. Again, the whole world thing is relevant.
And, since boomer spending is income for later generations....
Do you really think that money invested in the stock market is like SS obligations? (Here's another difference - Congress can repeal SS whenever it feels like it.)
What happens to the prices of those assets when the baby boomers retire and are pulling out more money than there are young workers putting in? You have the same problems as SS. What if we had all of that SS money in the market? It'd be a disaster.