Good but... if by sending the child observer to the future to change the evolution of the observers so they are more empathic...wouldn't that mean that Peter when he came back from the other side with Walter as a child would have drowned? since there would be no Observer to save him from drowning? and then with no Peter the worlds would have destroyed each other...paradox's are such pains arent they?
No, not necessarily, it was September that saved Peter from drowning. The plan was to change the evolutionary path chosen by the scientist not to keep the observers from ever existing. Also note that September (if that was his name) donated genetic material to creat the anomaly which likely means he himself had some mutation to pass on.
So the observers would likely still exists but would observer for different reasons (in other words not world domination). This, if it is the case, would still leave the door open for the observer to save Peter,...
I've only been watching Fringe regularly for the last 2-3 seasons, so I missed the very beginning. However, I believe I recall at one point that September admitted it was he that caused Walter to miss the fact that he found the cure for his dying Peter. Thus if there were no Observer incursion, Walter was able to save his own son and thus never traveled to the other side, never brought the other Peter back to our side, and never fell into the ice.
If someone with more episodes under their belt can verify, I'd appreciate it.
The point I was trying to make was that the Observers wouldnt have been destroyed or never created by their form of selective forced evolution. They simply would have made different choices using the anomaly as a template (knowing that they didnt have to sacrifice emotion). So the Observers would have existed and they likely would have observed as well as been noticed by the native population of our dimension / time. The reasons for observation would have likely been different though.
However, I will point out that intellect and emotion were present in invading forces throughout our history so this technically shouldnt have mattered either way. The presumption is that the Observers with emotion would have been compassionate and evolved enough to have other noninvasive / nondestructive interests, .
Think of it in terms of Klingons invaders caring nothing for the needs of those they conquer and the Federation with the prime directive (not wanting to alter the evolution of less evolved cultures),