The chances of bitcoin will be illegal is low, the government will use bitcoin and will control bitcoin the future. They can earn also from bitcoin, they just need to wait until bitcoin price will hit high rate and they come as if they care about it. We are in the world that the government controls everything that we do and bitcoin is for sure also be in the governments hands. As long as they ear they don't care about other people. They care about themselves and the economy. So surely they will not make bitcoin illegal because they can also make profit from it.