I'm confident you're wrong. Japanese publishers aren't on the market like the western ones. People keep calling for SquareEnix, Capcom, Sega or Konami (lol) being purchased.
And why would they? Sony is already getting those games, often as exclusives.
They're on the market, just not as much for foreign companies.
Most of the major Japanese studios have already gone through major mergers.
Square Enix (Taito)
Sega Sammy (Atlus)
Namco Bandai
Koei Tecmo
Konami and Capcom are really the only ones who haven't gone through major m&a.
But they're due for further consolidation as they're all significantly smaller than their Western counterparts.
Bandai Namco is the largest, but they do so much more than just video games and they're still less than half the size of EA.
I think we'll see Sony acquire FromSoftware and/or Kadokawa and potentially Square Enix, though they should aim for Sega or Capcom instead.
I think we'll see the big Japanese companies merge into 2-3 major firms as AAA gaming alone is too much to handle for smaller companies.
I could see Nintendo buy Sega, and Sony buy Square Enix. Capcom merge with Namco Bandai and Koei Tecmo merge with Konami.