It's exactly this kind of thinking that made Japan into the mess it is today. First off, it is impossible to define 'Japanese culture' because a culture is not an ever changing, static thing. It evolves and changes constantly. Japan has had immigrants for hundreds of years, but they have never fully accepted the implication of it. Foreigners have always been second class citizens, even though racism isn't as blatant as it is in other countries, it is very much rampant. (believe me, I know, I live in Tokyo). Many of them though, believe in a fixed idea of how the 'Japanese mind' works. The whole idea of Japan being this unique country, impossible to understand as an outsider, stems from this.
But this is nothing more then a myth.
All of this has led to it being a country that now, in the face of widespread globalism, can not compete with the rest of the world and doesn't know how to accomodate to foreigners.
Looking at Abes' plans, I can safely say it will probably fail, because they want educated foreigners. Somebody with a good degree though, can work everywhere he or she wants, instead of Japan, where you will never fully accepted and will have to adopt to Japanese work life, which is soul crushing to say the least.
Many people will come but most will leave within a few years, which is what will happen to those they want to keep most of all.