Yeah, except that Bitcoin cannot be shut down because it is decentralized - big difference from eGold.
True. But lots of people can stop using and those that aren't yet can be motivated to avoid it if it's continually associated with scams and is a pain in the ass to use.
Ponzi schemes should not effect any true Bitcoin users. If you are in it for the Ponzis, and you loose out on a
PONZI, then you have no valid argument. You got into these type of "investments" knowing the risks involved. If you are a true BTC holder the ponzis should not effect you.