what would be the intensive to break apart into new tribes or avoid being beaten and assimilated though? like if they knew that once there was one final team they would get out then why would they feel like fighting? i would say you might get around it by making it so only the original tribesmen can get out on those terms and the assimilated ones would have to go through the game again, make new tribes etc, to get out?

its sounds interesting though. even though i know nothing about dds haha