By the way, now that I've ridden it, I can give some more thoughts about theming. Sure, it would be nice for the purposes that theming normally serves—engages your imagination, adds to the overall attractiveness of the experience, adds an element of whimsy or wonder to what is otherwise "I'm moving around fast." But separate from (or in addition to) theming, there's what I'm going to call "ridescaping." One of the big thrills in a thrill ride is the "Oh $%&* we're going to run into that thing." The first time I rode Invadr it got me pretty effectively as the very first drop gives you split seconds to see the large train bridge coming at you just before you swoop under it. Alpengeist has plenty of swooshing down into "gutters" in the ground or through a shed.
But one of the detractions about Pantheon's current state is just how wide-open its setting is. You're in a "cow field," under a blue sky, just moving around fast. You can generally see any part of the ride from any other part of the ride. The one moment of "will we hit it" is the headchopper. There's no going through any tunnels, around blind curves; not even any body of water to plunge toward (ala Loch Ness, Verbolten, and Apollo's Chariot). Yes, it would be nice to add theming for the sake of telling a story, but even some nondescript cement cliffs and boulders, or some large trees to screen some parts from view, would impact the experience.