How so?! I hear you say? as all of the cities have a Jarl already. It is simple, Helgen was destroyed at the start of the game, and is in an awesome, central and beautiful location in skyrim.
If there was a questline where you could rebuild Helgen, then you could become its Jarl. It could be a part of a larger DLC, with say.. the later part of the questline after becoming Jarl is taking place in the moot, where, you could throw your support behind one of Jarls to become High-king, if you can't become High - King yourself.
I think it would be a good DLC, with a lot of potential. What do you think?
