The pragmatic problem here is that it is not a straight line like in real life. By that I mean, in real life you have "League 2" <-> "League 1" <-> "League Championship" <-> "Premiership".

In this game the promotion players from many many leagues pool and re-sort into the next higher tier. So, it's more like "18 league 1's" -> "14 league 2's" -> "12 league 3's"...

If you were to add in relation to that system you would over complicate the rules. It would also cause havoc with abandoned and bot-controlled teams, namely really good teams ending up in league 1. This would turn off new players to the game as it would be highly likely that they end up in a really difficult league 1 with every opponent being a robot or abandoned team.