Here is my idea of a game mode. That if released would become the most played.
The game mode is 5v5 on howling abyss, there are five bans, and everyone chooses there champ.
This game mode plays like Aram start at level 3 the same items and summoner spells.
This game mode actually solves a lot of issues in my opinion. It gives players the option to play the champion they want and allows them to practice there champion. This mode will also be suited for beginners and veterans. It will allow new players the chance to play and learn champs stress-free. While Veterans can pop on for a couple of games on their favorite champ. This mode allows for skill expression while lowering the overhead stress of normal 5v5's.
The only thing is that there is no way this game mode would not be popular. I think that this mode could bring in the next generation of league players. It offers people the chance to play league in a simplified way and could better prepare people for summoners rift. This mode also would solve time issues as well. On average the game has been sped up over the years and this game mode would last only as long as Aram but allows for people to have a choice on what they play. This game mode offers the league of legends experiences while removing the macro aspect of summoners rift. It will appeal to casuals and competitors.
The con's of this mode is that it doesn't prepare people for 5v5 summoners rift and would take away from the player base of Aram, solo/duo, flex, and twisted treeline. The pro is that it allows for people to play the champions that they want. It delivers the gameplay experience of the league of legends without having to have knowledge of macro.
Knowledge of macro or decision making in league of legends is what defines players as they climb in ranked but this is what adds to the skill disparity in ranked as well due to the fact that not everyone understands how to play around objectives. New players do not understand macro but they can understand micro. This why this game mode allows for new players to practice their micro in an environment that allows them to express their skill.
Another consideration is that if this game mode was made ranked it would destroy the player base of summoners rift. It would be too popular as a ranked game mode. It gives people the league experience while being a faster mode overall. I think it would be a hit in internet cafe's as well due to the speed of the game and the skill expression it allows players on their choice of the champ.
Lastly, another consideration for this mode is that this would make summoners rift 5v5 the pinnacle of team league of legends play. It would set 5v5 summoner rift up to be where the best of the best play and for those that want to work together through team comps, communication, and teamwork. Solo/duo ranked no longer provides players the feel of skill expression when one teammate's poor decision making can cost them a game. This is why a game mode that allows skill expression while removing macro offers a better player experience.