Who was the child that locke was chasing and told him he could not break the rules?
It seems that if the smoke monster and Jacob were at one time "men" then perhaps they were tasked with making the same decision that the candidates will have to make. Become protectors, become the smoke monster, or do nothing. Sawyer seems to have made his choice, it seems he has in fact sealed his fate and sold his soul to the devil to get off the island.
The balance of the island good vs evil (white stone and black stone on the scales) is now out of balance. That is why the white stone was thrown into the water. It leads me to believe even more that Saied has also made a deal for his life and sold his soul. He will more then likely become a saboteur inside the temple.
My guess is that someone unexpected will take the role of the protector. Hurley would be my pick, as he seems to want to be the hero, but is not often included to be given that chance. Jack would be to obvious of a choice.
Thats all I have for now...
can't wait for next week.