As you should know, the hybrid view takes a satellite map and overlays it with a street map showing roads. If your zoomed out a great deal or zoomed into a forest with no roads etc... then you wont see any change I don't think.
Yes, I know what the hybrid view is.
But even being over downtown San Francisco and zoomed in quite a bit, there aren't any streets or highways to be seen, just like the regular sattelite view.