Oh I completely agree with you on that, which is what I meant with the self-fulfilling prophecy line. It's a tactic that has been around nearly as long as literature has and is perhaps most famously seen in Oedipus Rex. He hears a prophecy and decides to avoid it, so he radically alters the course of his life with the end result being that he causes the prophecy to come true. Mat has a fairly similar experience.

The counter-argument is that because it was destiny, or fate, it would have happened anyway without the interference of the Oracle/Snake people. My counter-counter-argument is that counter-history is dumb, because there is no way to ever possibly know.