Not maybe, it is really indeed a silly thought and nonsense, in my opinion.

Bubble and volatility is different, as well as fiat and Bitcoin. Bitcoin is the newest currency and revolutionary while fiat is just as old as earth. If Bitcoin was just a bubble, I think after bursting (deflating) it wouldn't have a huge comeback just like what's happening in Bitcoin every time its price decreases a huge one. Also, inflation doesn't exist in Bitcoin, and the most impossible thing to assume is that Bitcoin is just a Ponzi, that's too hilarious.

It wouldn't live too long if it is just a Ponzi.