This is beginning to look like another repetitive "semantic game." What you call a "pyramid scheme" others would define as building up a P2P-proof-of-work-trusted-Network, which becomes stronger and of more value with each participant. Where you interpret a relation between diminishing amount of participants and value, others understand that the rise and fall in price follow directly upon good-or-bad news about a future digital, yet vulnerable, currency; any new currency has to deal with volatility in the beginning.
Bitcoin and the bitcoin market system are two different things. Where one is just a neutral piece of software, the other is a well marketed pyramid scheme.
And again I'm reminded of religious forums. Where I see fantasy, others see the word of an omnipotent god. And no explanations are given for religious dogmas, they just are so and I just am wrong for not believing it so.
Nobody can know for sure wether this Bitcoin-Network is sustainable or not, whereas you seem to have some fortune-telling capacity predicting the latter. Anyway, my common sense tells me you are deliberately trying to spread fraudulent information.
Well, no one can predict the future, but many people can speculate the probable outcome. And I still haven't found one solid argument that the bitcoin expansion is sustainable. All I see is high hopes from people who wish for an easy fix to get rich.