I do not think SS benefits will go away. But there's a strong chance it may be reduced in the future.
As for the people who think that their SS benefit is an inalienable right, they obviously do not know that in 1960, the US Supreme Court already ruled that it was no such thing in the case of
Fleming v. Nestor.
The court said that Congress could do whatever it wanted with SS. Here's some exact wording.
“To engraft upon the Social Security system a concept of ‘accrued property rights’ would deprive it of the flexibility and boldness in adjustment to ever changing conditions which it demands.
It is apparent that the non-contractual interest of an employee covered by the [Social Security] Act cannot be soundly analogized to that of the holder of an annuity, whose right to benefits is bottomed on his contractual premium payments.”
SS is a tax collection on earned income, which is then used to fund a welfare program. It's just that simple.
When you pay taxes to fund road construction, or paying for defense spending, do you have a direct say in how the money is spent? Although SS benefits go to you directly, you do not have any more say in it than with the other taxes. That's what the Supreme Court meant.