The concept that there is a race of wise and powerful ancient people is a theme that runs across many story lines and movie plots. Some of those plots have appeared in the television series Stargate, Doctor Who, and Star Trek: The Next Generation (think Q); the videos games World of Warcraft and Ninjago; movies like 2001: A Space Odyssey, and the Alien series; and in literature think the Cthulu Mythos by H.P. Lovecraft or Contact by Carl Sagan. They go by many names: the Illuminati, The Templars, The Ancient Egyptians, Atlanteans, etc. If you want to get a real flavor for a fervor for ancient ones, look up the Annunaki.
What in our psyche creates in us a desire for an older and wiser race of people? Is it a cosmic extension of our own childhoods? Do we seek some imagined wise parent that will come and teach us the secrets of the universe and then buy us a cosmic ice cream cone to make us all feel better? Maybe it's spiritual. We desire a connection to the beginnings of the universe and ideal these powers in physical forms we can relate to. Is it that we don't trust ourselves enough to try and figure out the answers on our own. How nice it would be for an anthropomorphized version of the Wikipedia of the Universe to appear and guide us through the rough waters.
The people of Pa'Chot also wait for the Ancient Ones but their elders of history are not mythical creatures. They are simply human though from another world. They have been waiting a long time for them to return and when they think they finally have returned, they are jubilant. The truth, however, will not be a chance for celebration.