Riot needs to invest in TCG
TCG = Trading Card Game, very lucrative business, you will make a lot of money especially with an already established brand. TCG collecting is very addictive and will rope in a lot of people. First editions, foil cards, rares, etc.
MtG Magic the Gathering started with nothing, now imagine what Riot can do with an internationally renowned brand like League!
I think this would be a much better idea than board games which is more niche