Of course it's not. But it still represents an average 15% loss of take-home pay to wage earners for the next 75 years, assuming the GDP and the size of the workforce remains stable. If we're on the cusp of an extended period of recession, and if additional factors like Cap and Trade reduce our production, and unemployment stays up, then that's going to exacerbate the situation for the remaining wage earners.
If GDP and the size of the workforce drops, that's going to require an increased percentage of GDP siphoned off in taxes to meet those liabilities.
No one works for 75 years. For some portion of those years, you are collecting those benefits.