Yeah I said it.
Bring the dwemer as a playable race for a expansion pack after all its 1k years before skyrim, and add the necromancy skill line as icing on the cake. This in my opinion is a great leap for further achieveing the RPG genre, and fortifying it as it reflects popular pop culture movies such as lotr, the hobbit and other franchises similiar to lotr not many, but still existant (example the game tibia, runescape) stress the need of having these four races that is humans, orcs, elves and last, but not least dwarves. Only problem one would counter would be what faction to add them in... I personally think the easiest way out would be to label them as neutral. Imagine playing as a Dwarf Geomancer if they add a earth based magic tree I really like those kind of spells.
It could be used to spice up the game a bit more I mean to make people go back to the game to try the new race instead of just new features, and changes to classes, systems etc...