It could also be because Yakuza has stretched out the Kiryu saga for far too long now. He's old, chooses to be out of the underworld life, and the story can only force him back so many times. Haruka's no longer a kid either.



I keep expecting each new Yakuza title to introduce a successor who will take over the franchise from him, but lol they're not doing it. Frankly, if they're not going to hand over his mantle over to a successor, they're better off rebooting the franchise.