Some bad ways the events of Skyrim could end:
1. Warp in the North. ALL of it happened, but none of it happened, and then the devs rewrite all of your achievements for the plot.
2. Fast-forward 200 years again and have some NPCs mention the events of Skyrim as footnotes and rumor.
3. Take the Oblivion route and have the Dragonborn become the head of every in-game faction like the Thieves guild and Dark Brotherhood. The devs have to please everyone. Also, the Dragonborn will be remembered as a vampire.
4. The Dragonborn abandons his responsibilities and DLC-family to go to Akavir.

Let's try to keep this from turning into an off-topic argument and everyone just simply state what they want to happen in the next game concerning the events of Skyrim.