Although TSL is #1 in the world in ODA and ODD, the three best tribes in the world for the longest period of time has been TSL, Skill and Anarky, therefore although TSL has been dominate, they havent faced any true competition.
As for this potential conflict (assuming that there is a merge AND that the relations somehow disappear with TSL...which is many assumptions), this would just be another big war that would not result in an end game situation. It will be just like what ive been experiencing on W11 and W2.....3+ year old battles that change shape, but no one ever gets the upper hand (85% control of the world) to create an end game.
No kiddos....it will just be a different looking war....but a long, drawn out war nevertheless
What would be funner is to have continental tribes instead....and the goal is to take the continents next to you...