What if leveling was team-based, not per player (similar to Heroes of the Storm)?
HotS has it so that everyone contributes to a team's overall level, and that one lane falling behind isn't nearly as drastic since your other teammates could be picking up the slack.
Hypothetically, do you think it'd be good for League if level was team-based, not individualized? I see a lot of threads of people saying "I dominated top but my mid and bot fed so it's no use" and wonder whether a team-based level system would be healthier or not.