Skyrim mods are more than content packs. There is one that converts it into a 3D platformer, one that converts it into a puzzle game and one that converts it into an FPS by giving everyone a gun.

At some point you have to consider the fact that there really isn't much left to do in FPS. When Quake and HL came we were still in infancy. While CS survived every other mod died a horrible death in neglect. People now know what sucks. And what doesn't has been honed to perfection and there really isn't much left to do anymore.

If you want to see modding don't look at FPS, look at Minecraft.