A perpetual ponzi scheme will go on forever, because there’s always a endless stream of people who think it’s the person in front of them whose the sucker and not them. That is, even when people KNOW it’s a Ponzi scheme they will still play the game.
That’s the crypto market. Each coin is as close to a perpetual ponzi scheme as you can get. The coins won’t be worthless until there is only a single sucker left.