Japan sales (Week 1): Media Create/Famitsu/Dengeki - January 01-07, 2018

[PAOerfulone]

Well, I wouldn't say it shrunk drastically from the PS2.

PS2/Xbox/GameCube/DC combined install base - 30 million
PS3/360/Wii combined install base - 24.9 million

PS4/XBO/Wii U combined install base - 9.1 million

Even though the market shrunk in the 7th gen from 6th gen, it was still pretty healthy. It was this generation where it dropped like a rock, but even then, the PS4 is expected to at least match the PS3's install base.

But, I see what you mean by how Final Fantasy has appealed less and less to Japanese gamers and more towards Western ones.