League of Legends MMO?

Idk about you guys....but i think an MMO about the characters of LoL would be pretty amazing. Just think about it for a second. You make your own champion and you fight for your chosen city. You level up and command sieges against other cities and take over all Runeterra (at least attempt to). The lore behind each champion alone is enough to create an amazing MMO spin-off. How did WoW become such a massive game? It started as an RTS. The possibilities are endless. Current champions would be NPCs who are there for specific reasons in specific areas and help you complete your quests. PvP would work similar to the way League is now. IDK...just a thought lol.