I think the easy answer to rush into is "screw the Japanese market". We can all paint a picture of how they are irrevliant now, won't buy the console in the home market, etc.
But Xbox 360 did NOT become a ubiquitous console through bro-shooters and western games alone. It was gently pushed by exclusive 360 titles from Mistwalker, Team Ninja, Cave etc.... and it was greatly solidified by the multiplatform support from Capcom, Konami, Square Enix, Namco, Sega, etc.
Without some sort of specific focus on Japanese support, it will never capture the total breadth of the market. Without the total breadth of the market, it will not be as ubiquitous as the 360 was.
It would be a mistake to double down on the likes of Activision, Epic, Bioware, Irrational Games, EA, etc and assume that's enough. There are entire demographics of gamers who will be just fine with a PS4 or Wii U if you don't give them some sort of exclusive Japanese content... that's my opinion.