Bitcoin will not be a ponzi if, and only if, it succeeds
Don't be an idiot. Bitcoin is not a ponzi.
Ok, now I have to be that guy.
Actually bitcoin does have at least two qualities of a ponzi scheme:
1. Early investors who gradually change back to fiat are basically earning money off the last round of investors.
2. Investors heavily advertise it because they know that the more new investors join, the more they gain.
I am not denying the absolutely awesome technological wonder that bitcoin is, and the fact that I can use it to move money across countries in a breeze (operation otherwise made unnecessarily painful by the sucking bastard governments and banks involved)
Still let's admit that we are in the speculation forum watching markets because we hope to get rich, and bitcoin keeps us hooked because of 1. and 2. above.
If bitcoin is a ponzi scheme then the US dollar is too.
The US dollar has nothing much to back it's value. It's 100% marketing and people invested in US dollars want more people in to uphold it's value.