The fact El Salvador accepted Bitcoin as a legal currency does not mean that other government across the world will accept it someday.
That doesn't really matter, as bitcoin doesn't need government support to function. Once enough people realize that bitcoin is the better way, they can switch without anyone's permission, and the governments will eventually be forced to adapt once everyone leaves their system.
But as of now, no matter how popular Bitcoin becomes, it will keep facing the wrath of the angry government who need to keep people poor.
I disagree that the government needs to keep people poor; they just need to keep them under control. Bitcoin isn't trying to bring wealth, it's trying to bring security and sovereignty, and to allow people to control their own money. This is what the governments want to stop, as bitcoin is a direct attack to their power.