Just spoke with several financial experts with backgrounds in the banking sector. They told me once Japan opens itself up to the Bitcoin the currency is very likely to reach the 30.000 USD mark before 2020 since
Japan has been known to be a trendsetter and have high influence on the EU and US markets.
I think that bitcoin can reach such a mark, but it's not even about accepting the crypto currency by Japan, but in the interest of all inhabitants on the planet and lifting of prohibitions in those countries where it was banned.