Just because all of the previous ponzis have stopped paying, doesn't mean that they all will.
By definition ALL ponzis will stop paying because of math. So your claim is bullshit.
Think about how social security works, when you compare it to the definition, it's a ponzi too.
The creation of a Social Fund with which to distribute benefit in various forms to society is nothing like a ponzi. You don't contribute to social security in order to 'win' more in return than you pay in, you contribute because it is your civic duty as a citizen of the society you are part of to help fund such services.