Japan has become pioneer in accepting bitcoin legally.Definitely it has boosted the price of bitcoin more.It has become an eye opener for other countries to adopt bitcoin.
I agree with you if more country will accept bitcoin. The more country demands the price will go up Japan adaption is the biggest driving force behind bitcoin even south korea encourage people to turn to bitcoin because it can be a more stable way to conduct transactions.
Japan has already declared bitcoin to be a legal currency and so we shall see many big companies and multinationals adopts bitcoins in near future. Since many of the companies in japan are multi-national, this means bitcoin will be adopted by such companies worldwide making it a real big booster for bitcoin itself.