The lore team has been moving... kinda slowly. The bilgewater event and the follow-up to it were really great, and I think the community feedback on that was good enough that they'll keep it up with those kind of stories.
Downside to that is it'll take awhile to get through the whole champ roster. Based on what I have heard about what the narrative team does all day, though, I can almost guarantee that they have started thinking about these issues. We won't hear much until they are ready to commit to a story, though, and that could be months/years away.
EDIT: That post kinda sounds like a dig at them. I don't intend it to be. The fact is, writing good stories with strong characters is time consuming. Please recall how long Georgie is taking with Game of Thrones. The only reason we don't normally think about the time it takes is because we get a larger finished product on the front end.
Riot is taking their time to make sure they do it right now. That's been their focus. So we need some patience, and it'll pay off!