"So I hope you enjoy this last story... very much." Robert Ford, moments before his death.
After his son's death, Arnold Weber realized that the Hosts were sentient beings, and thus, deserved freedom from the park. His associate and best friend, Robert Ford, however, disagreed and decide to open the park for public.
Without option, Arnold initiated a plan to destroy the park. Upon using the Reveries, a piece in the hosts source code that could allow them to actually kill humans, Arnold enabled Dolores Abernarthy, the park's first host with this ability and ordered her, alongside Teddy Flood with the task to kill all the hosts in the park. When Dolores and Teddy finished, Arnold ordered Dolores to shoot him dead, which she did, then shot Teddy and then herself.
Upon witnessing what happened, and realizing that his friend was right, Ford decided to dedicate his life to make Arnold's dream to come truth and set the hosts free from humanity. However, due to the technology of that time not being able to make it happen, Ford spent the next 36 years of his life to make it happen.
At some point in 2052, Ford finally made progress.
He give a speech about this narrative to the Delos board at a gala in Escalante. The gala is an event put on to unveil the new narrative, and announce his retirement.
The narrative was supposed to involve a new "villain" named Wyatt, which was Dolores Abernathy herself - having achieved consciousness -, as well as also involved the decommissioned hosts kept in Cold Storage, all now free of the park's control and capable of harming humans.
The viewer is lead to belive that this final "narrative" is unlike any previous narrative, and is instead "based" on the murder of Arnold years before. Dr. Ford states that "It begins with a murder--This time by choice." That is, this time, Dolores independently chooses to murder Dr. Ford, whereas before she was compelled to murder Arnold. In this moment, Dolores truly becomes a conscious agent, acting of her own will (having reached the center of "The Maze").