Overworld Map for LOL Progression

Just like Mario or Candy Crush, LOL should utilize an overworld map to show game progression. Summoner's Rift starts out as a forest. Everyone gets to play Summoner's Rift decorated as a forest with a river dividing the board. The next level is the desert version of Summoner's Rift. Same map design; only it looks like a desert. The river is now a ravine. Dried up. Because this is level 2... you can now select the forest or the desert boards. Level 3 could be the black swamp. Level 4 the icy tundra, and so on. The map can go on and on, but you have to meet the milestones in order to unlock the new map layout/terrain. Now you can physically see your progression using an overworld map! Awesome! =D