You've built the brand up, you have a rough framework for a Lore-rich world, when this game reaches the end of its lifespan as all games do, the only option left is....
League of Legends, the MMO.
You know it's true.
if riot do an event on my story, they'll have events in this game for years to come, so idk why you're worried... if a no factor like me can do such stuff, they got enough for a decay...
Last I heard they were thinking about doing a League fighting game. Not sure if it's true or anything but it sounds pretty great.
I could almost see an RTS or figures game in the setting- there are certainly enough factions for it.
