Right, so I'm making one more argument and then leaving until update, because people are letting their passion get the better of themselves.
The sacrificing of our king is specifically so he can go to the heavenly realm to help the spirits there, on behalf of the people, or get them to lay off the people. Most kings will not be considered to have that ability, far more likely is that we'll get a more formalized burial method, cremation at that. It will be touted as giving people a means of passing on to the afterlife, and helping the people after death. The spirits will slowly stop being completely mystical forces of nature, and go to being the people of old, providing deeper connections with the land and each other.
There, a realistic yet possible positive outlook to counter the realistic, but negative outlook.