The problem with BitCoin is that as it's not backed either by any link to any source of value or government fiat, it has no inherent advantage over any other cryptocurrency.
There can only ever be 21 million BitCoin, and the costs of mining them to generate new ones is getting higher and higher.
So after a while all that will happen is that new cryptocurrencies will emerge (It's already happening - Etherium, for example) and the cycle will happen again.
Meanwhile, Governments and social institutions will do everything they can to thwart the tax-avoidance capabilities.
