You can already tell by the declining popularity of playstation in Japan that the PS5 is going to be something like the Switch.
Unless Sony doesn't care about the Japanese market anymore.
They do and they do not need Japan. PS5 will be a traditional console, because Sony has more world wide impact, however, they will lose traction over Japan overtime, but at the same time it won't matter much because the major publishers are also moving more to western focus as well, so games like Final Fantasy, Resident Evil, Monster Hunter will be on PS5.
At most because of the decline of the brand (Playstation) in Japan will attribute to lower smaller focused games moving all resources to incorporate PS4/PS5, Switch/Switch 2 and PC or complete abandon that section and move to mobile.