I, Robot question


WARNING: "I, Robot" spoilers below
I cannot understand the ending, why does Sonny go to Lake Michigan, and why do all the Robots turn their heads to acknowledge them, it doesn't make sense. Can someone enlighten me?

"Money won is twice as sweet as money earned."

And this is my BOOMstick!
Someone enlighten him how to use the spoiler tags.
"All I have in this world is my balls and my word, and I don't break them for no one."

WARNING: "I robot" spoilers below
I think it was the prophesy coming true. The one from his dreams. Sonny(robot with a conscience) will be their saviour or their deliverer, and will now be like the leader of the older obsolete robots who have no conscience. I say this because of the last scene where they were looking up at him. The picture implying they would be "looking up" to him in the future. Although that's just a guess. I haven't read the books and I'm having trouble remembering parts of the movie since I saw it on opening night.