By japan we can easily predict that they will lately fully accept bitcoin as a currency and a payment method looking at japan's current technology state they are one of the top developed countries which makes them more likely to adopt newer technologies such as bitcoin and many more in different industries
It is glad to see how Japan takes some consideration about crypto. They just want to be the leading country who used advance technology and actually they've proven for many times. There is big question why China never have this technology, in fact, they are one of the most growing country but they banned crypto.
People have already know the benefits that they will probably get by having this technology. What makes this thing attractive is that it is really applicable to the system we have, we are already in computer era.