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.
An opinion + a number = An opinion.
The data are not available to make such a calculation. While they are obviously correct that an open Japan would likely raise the valuation, ascribing a number to that is total guesswork based on opinion not math.