So the ideas:
1. Just relegate the bottom 4-5 from the current game, combine with the draft list and have the "A" and "B" league with promotions and relegations from next season/year/game.
2. Split into 2 leagues for the next game, US and Rest of the World. Top "X" from one league and top "Y" from the other form the "A" league for the game after and the rest make up the "B" league.
3. Randomly split into 2 leagues and then follow #2's plan Top "X" from one league and top "Y" from the other form the "A" league for the game after and the rest make up the "B" league.