https://www.youtube.com/watch?v=eSuDltodyGY
I got this in my recommended and it made me think of the tier 2 talent stuck in NA because of lack of spots and then I started thinking about SA losing all their best teams and having to rebuild the ecosystem.
I don't know much about the cost or business politics of splitting NA and SA, but it made me think if affordable would it be optimal for Riot to split the leagues up.