I think most countries will accept bitcoin after 2018 because they will know the potential of cryptocurrency worlds and they will only issue corresponding laws and regulations instead of excluding cryptocurrencies and we look forward to that One day, not far from us.
Yes, the government only needs to review the potential of the world of digital currency. so they will be able to accept bitcoin in their country.
however, once 2018 is over I think it's still too fast for bitcoin to be accepted in many countries. because I think cryptocurreny technology will indeed succeed in the long run. it is my prediction because everyone in this world needs internet and understand the technology to use digital this currency.