You guys are exaggerating the importance of the JP market. As long as the PS4 is selling great in the west, big/med sized JP pubs will have no choice but to develop for the system.
Anyway, I really don't think monitoring the PS4 situation closely on a per-hour basis or whatever right now will end up painting a positive picture anytime soon. Japan doesn't mind holding on to older systems for a while, there are notable console games still coming out for PS3, and there isn't anything really major coming out anytime soon.
Through the weeks, as the supply situation improves, we'll see how well the PS4 holds on, but at the moment that's neither here nor there. The situation will eventually improve though. I just hope it's not far off from PS3.