Wouldn't it be awesome if along with the free champs every week, you could trade champs with someone to play a champion you don't own? It could operate on a charge system where you have a certain amount of champ trades you can use to get champions you don't own, and it could be similar to hextech chests. Every few weeks you get another charge, or you could purchase a charge from the store for something like 90RP (similar to skin boost). This could help everybody because it would be another source of revenue for Riot Games (look at hextech crafting). Another way to do this is like ARAM rerolls, where you gain points towards your next reroll, or in this case champion trade, just by playing games. Upvote if you want Riot to see this!