Google and YouTube are changing the world, sure, and they definitely are exemplary of the kinds of computer-age innovations that Epcot is all about...but in the American Adventure montage? I'm not sure they fit. They aren't really representative of the classic, inspirational "American spirit", at least not in the conventional way the AA montage celebrates.
I agree with you about 9/11 tributes...for every genuinely moving one I have seen, there are quite a few others that feel contrived to the point of trivializing the actual events of that day. But the AA montage has always managed to be a truly stirring experience, despite the fact that it's coated with a healthy layer of cheese. I have no doubt that the images of 9/11 in the AA update, though they may be accompanied by a clichéd musical arrangement fresh out of the 80s, will be just as stirring an experience simply because they're seen in the context of the American Adventure show, as brilliant, beautiful and tasteful a survey of American history as I've ever seen.