Honestly I think they should make it 16 teams with 4 NA teams, 3 EU, 2 BR, 1 JP, 1 KR, 1 SEA, 1 OCE, 1 LATAM, 1 TR, 1 CIS. Or Maybe you give 1 slot to OCE/SEA and give 2 to TR in this case but idk. The bigger the tournament is, the more likely an underdog wins, which are always the most memorable, but also the less inclusive or rewarding it is to make it there. 16 is a perfect number for a bracket and would allow for more regions to be better represented. Also maybe you could take away a NA slot and give another slot to TR in the scenario given but the NA scene is the biggest in terms of orgs and viewership and I have a bias towards more NA teams so idk. I'm assuming with 10 teams, they will have 2 groups of 5 play and then the top 2 teams from each group advance to a bracket which should be good as well.