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Also, keep in mind that the "big money" in Japan is with the older generation, so even if the younger generation may seem to be more open minded, they don't have the money to invest in new things.
Rakuten Group is one of the older generation. The CEO of Rakuten is 51 years old and he is bullish on Bitcoin.Rakuten was only established in 1997. I'm more interested to hear about keiretsu type companies when talking big money. But, well done you found one. I can see where you're sentiment of "huge adoption" comes from.
Even if Rakuten goes with bitcoin integration in Japan (their only one currently is in the US), it does not mean that bitcoin will be largely adopted by the general public. Exactly because - like you pointed out in the other thread - there are many, many options available to the Japanese already, most of which are more convenient than the use of bitcoin.
Bitcoin has one important advantage over traditional solutions: low fee.
Once Japanese understand the technology and advantages of Bitcoin, they will accept it with no doubt.