Quick mafs right ? True that the current Bitcoin system is deflationary but that doesn't mean it can't disrupt an economy. If enough of the economies money (% wise) goes into Bitcoin, you can be sure the economy will suffer, unless they begin to accept Bitcoin as a national tender. We don't want the whole world to use Bitcoin, not at least simultaneously that would cause a world wide economic collapse, instead you want the change to Bitcoin to be gradual and for it to be over a long period of time say 25-100 years.