Following China’s stance on Bitcoin and ICOs it makes complete sense for that market to move to Bitcoin friendly Japan and South Korea.
Earlier this year Japan officially recognised Bitcoin as a Payment System and have been rolling it out across 200,000 merchants so with a Bitcoin friendly environment already in place in Japan its little surprise to see Bitcoin volume moving in that direction.
So with Japan and South Korea looking like new safe havens for Bitcoin this has helped Japan replace the USA as the largest Bitcoin Exchange Market with over 50% share of the global Bitcoin exchange market.
Will this lead to a more stable Bitcoin Exchange Market, time will tell on that one. There is also pressure mounting on the US Dollar so its possible we might increased Capital Outflow going forward.
Source and credits here: https://cointelegraph.com/news/japan-becomes-largest-bitcoin-market-as-traders-leave-china