I think you messed up the quoting as I got this as a response to me. I was about to write a lengthy response to Mycroft but you covered a lot of it with a bit more brevity. At the end of the day the ease with which you found a video with Kreia is why I tell so many people to do their own research, which is probably what I would have told him to be honest, especially when he dropped that whole "Citation Needed" bit in reference to a big part of the promotion used to sell "KOTOR2" especially when it was first coming out (ie George being involved in it, albeit indirectly, through his notes and such, even before the game was released there was a lot of discussion about what big secrets about the universe were going to be dropped... and honestly it did, by approaching the whole issue of The Force directly).
One point of correction I will make though is that the space bacteria are not "The Force", they are something through which The Force works. The Force is supposed to be like a metaphysical entity that is throughout all things, it's intelligent, but isn't a being like us, or the traditional representation of a god. It tends to work through what's there and presents the illusion of free will. Those "bacteria" are as I said sort of like points of articulation on a puppet, making it easier for The Force to work through specific people and do more, more easily, without needing to
be overt about it.
The thing is that Star Wars is based more along eastern styles of spirituality and the concept of "Fate" as opposed to western ones and the belief in free will, at least in how it works in a metaphysical sense. The basic idea being that everything is predestined but very few, if any, people realize it, and even those that do cannot do anything about it. Everyone has their role to play, and every choice you make is irrelevant as the outcome was predetermined before you made it, though from your perspective you think you still made a choice. Very much "we're all players and the world is our stage" taken to an extreme, everyone simply carries out their role in the story, oblivious to what it is. This kind of belief ultimately being used to reinforce caste systems and the like, with certain people being basically chosen to do certain kinds of things. In the scope of day to day life, if someone say commits a crime he does so because he was predestined to, but the guy who lops his hands off for it was also predestined to do that. All small parts of the backround of the celestrial drama so to speak. In such cultures trying to change one's fate oftentimes has horrible repercussions, but can also be argued as itself being predestined.
In the scope of Star Wars, nobody realizes what they are doing is predestined, only one person in anything remotely considered canon even suspected it (that we know of). To them everything is "normal" and as outside viewers watching the movies it still represents entertaining stories. That said, looking in from the outside, knowing how things work, and looking at the pattern, it's easy to predict where things inevitably have to go if the work is going to maintain it's integrity within the canon. They ended the story at the highest possible point for the given cycle, since it's all down hill from there until the next one.
True Prophecy is always a touchy subject when it comes up, as by definition if the future is predetermined, nobody has any free will. Star Wars takes the approach the precognition that it always comes true, as opposed to warning as possible futures, since the very force giving the prophecies is controlling everything and is pretty much saying "this is what I'm about to do". It's hardly unique, but ultimately Star Wars was about the way the prophecy was going to be fulfilled, not whether it was true or not. Nobody questioned the validity of prophecy either (which raises some interesting questions), but rather tried to interpet it.
It's also interesting to note while I'm rambling that this also features into "Knights Of The Old Republic Online" where they go out of the way in each character's storyline to have a prophecy about them (on Voss Ka) typically something bad which they want to avert, but they are told flat out "this cannot be changed, no matter what you do,
this happens"... and it does. It's really kind of everywhere in Star Wars when the people writing it have bothered to research it.
At any rate, this is all an academic argument, the point being that Star Wars has to go in a very specific direction from this point, or else it's not Star Wars anymore. You start throwing out all the prophecies, chosen ones, etc... and it's not Star Wars anymore. What's more as a few fanboys have pointed out, understanding this allows a sort of joking explanation for some of the series more laughable elements... such as "if Imperial Storm Troopers are such an elite force, their marksmanship praised earlier when they apparently disabled a giant armored transport, how do they miss perfectly lined up shots against guys running through open rooms right in front of them?", the answer to that becomes justifiable as the characters they are missing being metaphysically favored as part of the ongoing predestined story, even if The Force isn't working through him directly in terms of mysical abilities, Han Solo is needed to play is role for example, thus anytime someone shoots at him they miss, unless there is a reason for something bad to happen to him. Ditto for that whole "WTF" moment where Obi-Wan, dangling over a ledge with Darth Maul above him, performing an incredibly improbable super-move, taking him by surprise, and winning the fight (when if he could do something like
that normally, why didn't he?). Then of course there is the most obvious one that already smacked of divine intervention, involving a little kid (Anakin) hopping into a Star Fighter with no previous piloting experience, and then more or less "accidently" out flying veteran pilots and blowing up an enemy command ship.... it's interesting stuff to think about retroactively. Honestly though I think in the original trilogy a lot of it was just action movie cliques, but in the prequels they spelled it out pretty much in 50' flaming letters for anyone who missed the "immaculate conception" reference which was to me more eye rolling than the space bacteria.