That would actually be characterized as a pump-and-dump, not a ponzi. And if we used that term then we could at least debate the real question. Are the enthusiastic hype men actually cynical con-men trying to create greater fools so they can dump, or is the enthusiasm authentic by people who are genuinely long on bitcoin?
People calling bitcoin a ponzi scheme has been the greatest boon for the bitcoin hype tribe. It's so easily defeated by showing that bitcoin does not fit the textbook definition of a ponzi scheme, and that makes it possible to completely sidestep the concern that the history books may call this a "bitcoin scheme".