Considering the sales of the PS4 in Japan, the studios Sony needs to actually buy is Level 5, and any other studio that makes great RPGs.
I think it would be wise for Sony to focus more on Japanese games period. They're become far too westernized this generation imo.
if you do that. you have to do it when the generation starts immediately to catch on. they should probably try to penetrate the japanese market next gen by expanding japan studio teams and making them sort of run like Nintendo EAD. or acquire one or two small japanese studios
and try to make third party exclusuvie deals like nintendo does.
do I think sony will take that risk? no. because to be quite honest. am not sure they would succeed . its so hard to sell games in japan, you need big names. they should try to drop the PS4 price to 299 when the PS5 comes out. and support it longeterm in japan. or drop it this or next year tbh