Who else has pondered the possibility that the Ancients could be Jedi? Think about what we know about each:
The Ancients lived millenias ago, in another galaxy, were extremely technologically advanced, and figured out a way to leave their physical bodies once they died and ascend.
The Jedi lived along time ago, in a galaxy far, far away, and at the time we knew them, the galaxy they lived in was very advanced. They too, figured out a way to leave their physical bodies behind and become “more powerful than you can possibly imagine.”
We also know from Atlantis that the ancients had a special gene that allowed one to manipulate their technology. Some, more easily than others. We also know that Force sensitivity is inherited, presumably genetically. From this we could surmise that it’s innate Force ability that allows this.
Also, we’ve seen that the Ori Priors (representing the Dark Side) have a haggard look about them, much like the Sith and also exhibit powers similar to one powerful in the Force.
One discrepancy, however, is that from what we know of the Ancients, they were humanoid. Perhaps it was a small sect of humanoid Jedi which was isolated during the reign of a dark lord who conquered and destroyed most of the galaxy, then branched out after the Dark Lord had fallen. That seems like a weak explination, but who knows what could have happend in the time between Episode 6 and our present day.
(Please note, I realize that any similarities between the two universes are probably coincidental, and that actually admitting that they are one in the same would involve George Lucas sticking his hands in a good TV show. This is merely the product of an overactive imagination)