the critical mass has been reached now but there is one test left: Will we survive as an illegal currency?
Sure. Illegal drugs have been survivng and flourishing for decades even after they instituted the war on drugs.
This is my opinon, too. When I buy a house for 1m$, I could pay 450k$ in cash and 450k$ in BTC to save on taxes. The saved amount gets split. Or, travel to africa and return with a new car. Nobody knows how that got payed.
Finally, the ridiculous movie scenes where a drug dealer transfers money on a laptop watching a progress bar going left to right will become terrible reality ;-)