I really hope they ditch the energy theme based on what we've seen recently. I would much prefer a nod to science fiction and its impact on innovation and science fact. I think about the popularity of Cons and what not. People really like to understand behind the scenes on these. I could totally get behind a pavilion dedicated to how real world science and ideals translate into science fiction. Honestly, that feels way more "EPCOT" to me. Take something real (science fiction) and celebrate it for what it is. You could easily set the stage in the pre-show room and then enter the world of Guardians. And, you could easily tie in energy - or anything else, frankly - as the sub plot.
Honestly, the beginning of Horizons explored this topic in a very successful way, and it worked well for the park and its general mission. And, it gives the attraction longer legs. Guardians may fall out of vogue. But, I highly doubt the idea or genre of science fiction ever will. So, you update the pavilion to bring in some new IP in 10 years vs. having to lose the concept altogether.
Wishful thinking, I know...