* Benefits amounts are reduced for everyone (In my view, this is probably the fairest option)
* Retirement age is increased for everyone (I personally hate this option, but think that it's the most likely)
* Benefits become even more means tested than they already are (and they are, even though people claim they're not -- high income people get far less per dollar in than low income people) (In my view, this is probably the least fair option)
If you're under 50ish and you're counting on Social Security, I think you're making a judgement error. Especially if you're in the upper income quintile. Everyone that's in the top 20-25% needs to be putting the maximum allowed amount into their 401(k) every. single. year. If you can't save around 18% of household income in a 401(k) or 403(b) due to the limits, save after tax (unless, of course, you plan on working until almost age 70).
Personally, because I put a lot into my 401(k) I'll be much better off in retirement than I am now if I actually get Social Security and the pension that I've been promised by my megacorp, but since I'm 36 and all of the boomers are working on retiring, I'm pretty sure that both will be bankrupt.
As far as I remember through reading Madoff depositions, some of his clients knew he is running ponzi, so previous post's claim that its a secret don't always apply.
That would be a conspiracy then.
Moreover, it doesn't matter if it's secret or not because your wages are forcibly garnished.