Bitcoin is legal by some countries but some countries still not accepting the bitcoin.
What you think is Bitcoin become legal in all countries?
There's no impossible someday bitcoin will legalized all over the world especially now that bitcoin was continuously developing and being popularized by the people. But maybe this ia not the right time it takes too time for other countries to realize it's worth. Other countries government are really contradict on this system just because in bitcoin you are free to do anything without an authority.