What I want to see in 2019
A new Gamemode which has Runes/Summoner Spells and maybe items disabled...
And this Gamemode would have this system similar to the one you had during the Odyssey event.
Each Champion would have 3-4 sets of choices of how to enhance each Passive/Ability.
You would unlock these alongside other rewards by completing missions that would be specifically made for this Gamemode.