I am also confused why there's only one version of the ride. I mean, obviously money, but it seems dumb.
Then again, I think many attractions could be improved if WDW had made multiple versions. Star Tours has additions, but the additions came too late. It is a way better ride than it used to be, but the original version made many people sick, and they won't ride it now.
Another thing I'd like to see in GE is more unique greenery. The plantings are boring, and they don't add much. Compare the greenery in GE to the unique look of US's Seuss-land, or the fun WDW had with the World Showcase.