Thor 2 could be an epic telling of Ragnarok featuring the death of Odin in battle against Surtur and the Odin-force passing to Thor at the end of the film.
From Wiki:
The final occasion involves a massive battle against arch-foe Surtur on Earth, with Odin apparently dying once and for all, as the Odin Force—the source of Odin's power—migrates to his son, Thor. As Thor eventually destroys the Loom of Fates and stops Asgard from perpetuating Ragnarok—which ends the entire Norse pantheon and Asgard itself—Thor believes Odin may be dead permanently. The Odinforce appears to him in humanoid form and says that this was Odin's plan all along: that he break the cycle.
I speculate that I would be excited to see such a film.