I know what you meant with short term and long term.
You are making a lot of assumptions hence why you are contradicting yourself.
You dont know whether to claim a game can pick up on XBOX or whether it will be killed off.
Yakuza was originally a PS exclusive. But now you claim it became a success on the western market by releasing it on XBOX and on Gamepass (lets ignore btw the PS4's installbase in the west though).
It either did not sell well on XBOX because all previous games were PS exclusive or it did sell well on XBOX.
Then by going through your logic by how awseomely supposedly it did on XBOX, the same would have counted for FFX15 on XBOX and Gamepass which would have ignited interest in SE continuing the release of mainline games on XBOX.
Then again if you claim it DID well on XBOX, it goes against your claim that exclusivity killed the franchise because it would have been dead for decades since it was a PS exclusive to begin with before it came on XBOX.
If you on the other hand claim games benefit from Gamepass, then SE can simply release a game on XBOX and Gamepass and ignite interest
It is not SE's job to market XBOX's brand. It is MS's. If MS did well with their marketing in EU, then developers would have been more willing to support it. If MS doesnt care about their baby, dont expect others to take care of it.
Dont blame SE for MS's blanders.