To get a more "definitive" answer to your question perhaps you should go ask this question directly to one of the renowned bitcoin pumpers like say the Dollar Vigilante. Just ask him this simple question >>> "Do you think ALL of the world's fiat currencies will collapse on the exact same day at teh exact same hour? Or will they collapse one by one until there is just a single fiat currency left vs Bitcoin/cryptos?" If he replies that they all collapse at the exact same time then you are good to go for the long term if you are a cryto believer. If they collapse in "succession" then just wait for the 1000% one day gain in the last surviving currency ...then plow it all into bitcoin or whatever other "fantasy" you prefer. In the meantime. I dare you to short the last surviving fiat currency even now at this juncture.

http://bigcharts.marketwatch.com/advchart/frames/frames.asp?show=&insttype=&symb=uup&x=24&y=21&time=18&startdate=1%2F4%2F1999&enddate=2%2F18%2F2017&freq=7&compidx=aaaaa%3A0&comptemptext=&comp=none&ma=0&maval=9&uf=0&lf=1024&lf2=2&lf3=8&type=2&style=320&size=4&timeFrameToggle=false&compareToToggle=false&indicatorsToggle=false&chartStyleToggle=false&state=8

Go ahead...I dare you. :-)