if too many people is using bitcoin then government will make rules to tax bitcoin transaction and maybe the government will banned bitcoin, but actually now we already pay bitcoin taxes, everytime i exchange my bitcoin in local exchanger they will charge few percent of my bitcoin
I think if the government still forced to give taxes to the bitcoin will not run both because someone could manipulate their bitcoin address because bitcoin is anonymous so that the government will not know if you have a lot of money in another purse? bitcoin tax will not be perfect