Yes, that's the current pension system.
1. There's no set of players who are guaranteed to win
2. There's no set of players who are guaranteed to lose
3. No one is set to gain by advocating for the "current pension system".
Pension fund managers are guaranteed to win, and they win more as life expectancy goes down.
> 2. There's no set of players who are guaranteed to lose
Literally everybody else loses, as inflation eats away at the buying power of older peoples' ongoing or soon-to-start pension payments, and young people pay in to a system that there is now no guarantee they will earn from in 40 years time.
> 3. No one is set to gain by advocating for the "current pension system".
Plenty of people stand to gain, see above, as well as politicians interested in protecting the status quo and electability above all else.
Maybe the current US pension is set up like this, maybe not, that's debatable perhaps. But it's not an inherent feature of the systems everywhere unlike the problem with crypto"currencies".
If benefits-defined pensions are any indicator then both are unsustainable, and certainly not the future.