I'm happy to bet it's not happening. Japan is far too busy fighting amongst themselves and/or catering to themselves first and foremost.

South Korea, Taiwan, and China slayed Japan because they played for keeps and pulled no punches. Japan simply does not have the correct mindset to deliberately (re)conquer and succeed.

If this sounds brutal and/or flippant, allow me to say that I'm saying this as a Japanese-American. I will happily use my blood to shit talk my heritage, because honestly it's a fucking shame and it's even more shameful that Japan can't (read: won't) dig themselves out.