Everyone is entitled to their own opinion but Im not sure how you can call Bitcoin a Ponzi scheme!
"Ponzi schemes rely on a constant flow of new investments to continue to provide returns to older investors. When this flow runs out, the scheme falls apart"
In this case the returns are in the form of a higher price on Bitcoin
(
https://en.wikipedia.org/wiki/Ponzi_scheme )
Duuuh... Bitcoin only requires 2 full nodes to work. Like I said this is voluntary they come and go at will and we don't care. Maybe you're referring to bitconnect . lol
Hence even without new comers bitcoin still going to work. Making your ponzi argument invalid.