But those games would've blown up even if the PS3 outsold the 360 2 to 1, like the PS4 is compared to the XB1. Not everyone played Halo and Gears of War, not even on the 360, the PS3 audience was still big, the 360 audience wasn't only into shooters and sports games, and there was still a large variety of games that generation, with indie games finally beginning to gain prominence towards the end. Keep in mind that PlayStation gamers liked those games too and still do to this day. Japanese developers struggled because they weren't making the games people wanted to play on consoles for a whole bunch of reasons
Sure but that's more of a coincidence than anything else. Japanese developers would've struggled on consoles last gen regardless of the PS3 doing well. My point was more so that the audience on the PS3 was still active, even if it was a fair amount less active than the one on the 360, and PlayStation gamers, even now on the PS4, still go for and support Western games