One of the great things about Skyrim is choice. You can chose how to confront a certain situation in many small quests and decide the course of Skyrim in big ones as well. One of the things that would really complete Skyrim would be the option to destroy all factions individiually. Example: I like to roleplay with my characters, and therefore I make several of them. One can be a racist, light-armor, axe-and-shield diehard Stormcloak nord, while another can be a sneaky Khajiit assassin. Maybe the Nord would prefer to destroy the College of Winterhold instead of join it, and maybe the Khajiit assassin would like to get rid of the Companions because he joins bandits such as the Silver Hand. The option to either join or destroy all the guilds in Skyrim would create an opportunity to choose an identity for your character and let's face it, having the option to kill certain people is fun. I know vanilla skyrim already has the option to destroy the Dark Brotherhood and there's a very nice Destroy the Thieves Guild mod, but there should be more mods to destroy factions such as the College of Winterhold, the Companions, etc. Thanks for reading and considering!