Dungeon game play system/story mode

so this is something i have thought a lot about for this game. and in my mind it is 100% possible and can even offer different types of dungeons or even a story mode so here are my reason this could be a good idea for this game

A) if offers up a change of game play not just the game type but how you play each champ in a dungeon/story mode type setting. B) story telling. the endless lore that could be covered giving the game more depth. C) better teamwork. if your team can survive Diablo like difficulty's using skill, strategies, and play style PVP would come easier to new and veteran players. D) ramping up the damage. and increasing the difficulty and rewards for completing hard dungeons or "acts" that can be shown off in pvp.

these are only some of my many thoughts for this that could or could not work. what do you think about a Dungeon game play system/story mode. cuz i feel like im not the only one that has thought about this.