All ponzi's are just gambling. If you think otherwise you are delusional.
Right now, there's 1.34231128 BTC left to make payments with. If they do it right and wait until it gets wiped out to 0 to stop making payments, a new cycle can begin with fresh deposits. You might be surprised how long a cycle can last.
'if they do it right', 'a new cycle can begin with fresh deposits'.
All wonderful justifications for a ponzi scheme by the people supporting it. All ponzi schemes fail because 'they didn't do it right' and 'the idiots stopped pumping money into it, therefore it's the investors' fault!'