Why would they? Japan has moved towards digital mobile gaming in a massive way especially in the last five years even Sega, that's where everyone is making their money now. Its cheap to make and the returns are enourmous. The only traditional outlet they are comitted to is the nintendo handheld systems and even that may not last long. That's the reality of Japan and asia at the moment. Most of the consumers are playing mobile games now and not getting systems in their droves. If it continues which it should since this was predicted a while back it then remains to be seen if the japan companies can adapt if they want to continue making console titles.
Oh no, I have a good idea of what the reality is. It is a disaster. It's not something console titles can adapt to. Certainly not without major changes or casualties - franchises made dormant, structural changes like DLC or free to play integration, relegation of developers to mobile (hello Itagaki), and we already have these and still the consumer landscape isn't good. Apparently this past week's sales in Japan were noticeably bleak.
In any case, something's got to convince more of the gaming populace in Japan to pick up a next gen console if we're worried about console gaming, and that's not happening without more games. And then of course there is little reason, at least on the surface, to make that departure if you're a Japanese third party pub/dev and make low-risk high-reward mobile games. So, barring some radical realignment of tastes in the West (appreciation of Japanese games increases) and Japan (appreciation of console gaming increases, hey why not, apparently the guy working on Mana games wants to make a console Mana game, which takes major guts) or some structural change in localization practices there isn't anything to adapt to, I don't think.
Its Japan - that place is now Handheld central . Shame SEGA Japan haven't woken up the fact that its West and America when the main consoles sales are and you need Multi Platform games that are made with the west in mind . One day SEGA Japan may get it , but it may take until Yakuza 10 for that
You actually bring up an interesting thing I hadn't thought about - the irony in the West, namely America, purchasing so many consoles but being unable to put forth the requisite demand for the console games Japan is making. But that is no mystery.
You can always hold out hope against hope - against all odds the Tales franchise came back from dormancy in the West and now it regularly gets Limited Editions in the West and lots of general promotion. But this is bigger than one franchise, and I can't tell you what in the world would help the consumer division. Stop with the failed risks, sure, but that's a lot easier said than done.
The question of multiplat though is not something I'm sure is essential. For one - multiplat more often than not means PS4 and Xbox One, barring any seismic shift in Nintendo's third party relations and image, and even then we have to account for the concept of developing a game on three systems, which is costly and each has different infrastructure and blah blah blah.