Mark Steyn deals with this in his book “America Alone.” The problem in Asia is that the birth rate in Korea, Japan, China and even in India is close to 1.3 - 1.5 which is population suicide level. Japanese elders tend to be extremely healthy and they actually have robots for these people to care for them so that they don’t develop dementia. One of the largest problems in Asia (and now being imported to the US) is the suicide of the young. The US had a birth rate above 2.0 when Steyn wrote his book, but it has now fallen; not even the large families of immigrants is able to keep US growth above 2.1.
Japan may wish to go this route, but where will their military arise? They have a very severe policy on immigrants, and even those who stay for many years are not accepted as native.
The stimulus effects of monetary easing and yen depreciation can only lift the short-term economic outlook. It remains to be seen how Abe will sustain confidence with the severe structural weakness of low population growth, labor participation, private investment, R&D, free trade and productivity etc. all of which involve the risks of losing public support and provoking political conflicts.