There is only two ways:
Maybe Bitcoin is unsuccessful. Then it's 100 % loss.
I don't see how you can stop Bitcoin? There will always be a market for illegal drugs or purchases of a private nature online...
You can't stop it. I am talking about the case that it does not get main stream because the public does not want it.
It doesn't have to go mainstream. 0.1% of international transactions would increase the dollar price of 1BTC to four digits.
A tiny fraction of tax evaders, drug dealers and anti-banksters could easily do that. Considering how unpopular the Banksters are in Europe right now, I would be surprised if it didn't gain at least some traction.