Thank you for posting these numbers every week, Marth!
Switch sales are amazing, that's DS level of sales. As for the PS5, no matter if the low sales are due to shortages or lack of demand, the numbers are not good enough to be a viable platform for Japan-focused developers right now. Let's say sales pick up a bit and the PS5 sells 1.0 to 1.5 million units this year in Japan: That would make it very hard for Japanese devs to turn a profit. I expect many companies to try to support Playstation consoles for as long as possible, but the most likely outcome for the next few years is that many releases will be multiplatform (PS4/PS5/Switch at first and then just Switch and PS5) or even Switch exclusive, as the PS4 user base won't be viable beyond 2021.
And that might result in a noticeable shift in powers: Right now, Sony is under pressure from Microsoft with GamePass and their acquisitions in the West and from Nintendo's market dominance in Japan. In two years time, a decent number of popular western games could be exclusive to Microsoft, while a decent number of Japanese games could either be Switch exclusive or multiplatform instead of being exclusive to Playstation.