Total Annihilation Game Mode
A game mode for the hardcore league players.
Once an inhibitor is gone, it won't respawn; in order to kill the Nexus, each inhibitor would need to be destroyed.
The super minions will attack the two turrets guarding the Nexus, but after those have been destroyed they will focus on killing any creeps spawning out of the Nexus until all three inhibitors have been destroyed.
It would allow for a cooler, longer and more intense game play and I think it would allow the tables to be turned in a losing teams favor since they have more of an opportunity to counter play since every turret and inhibitor will need to be destroyed before the game can be won.
I personally think this is a cool idea, mainly because I like to think of League as a 'chess' kind of game and it would be cool to see strategy implemented more within teams.
Instead of a 'one player' experience, this game mode would require a higher demand for teamwork since it is nearly impossible that a single person could carry the match in this game mode.