When you think about it, there's a pretty good chance Final Fantasy XV is the most expensive Japanese made game ever.
These sales are a really bad omen for Japanese AAA development.
I think Japanese developers have miscalculated the success of the PS4 as well thinking it was basically PS2-all-over-again. It's not. It's very popular in the West with WESTERN games. Final Fantasy XV underperforming and Street Fighter V flopping should be sobering wake up calls. In Japan the PS4 is selling relatively poorly, it is no second coming of the PS2 in Japan. Traditional gaming is under serious threat.
It's an omen that they need to re-learn how to engage a worldwide audience after falling on their asses last generation. It's not an omen that they should refocus on the most rapidly aging country in the world by banking everything on the success of an unreleased and therefore unproven system in a desperate attempt to lure smart phone gamers back to home consoles.