Five ideas:
1. In short, rework the Dinosaur story. The pavilion is renamed Wonders of the Universe (featuring Cosmic Rewind). The focus is on planetary history. The first room is and explanation of how galaxies form and planets are formed (based on real science) going back to the big bang. This could be done museum style or by Glenn. You then enter the showcase room, and it continues that story, focusing on the planets of our solar system. Again, based on real science. You then enter the transport room, allowing us to see the formation of our solar system - form using their time travel device. Our Raccoon friend then interrupts, offering to take us on a spin through space to get a better view instead. And, of course, you need tunes, and we get to close to the big bang and just make it back.
2. Wonders of Energy. The Xandarians are creating a showcase to explain energy to our young, curious civilization. So inspired by Epcot, they wanted to add their knowledge. The focus becomes around sources of energy in the main room, going back to the big bang. The second room showcases our primitive energy resources (sustainable options), in a humorous way pandering to us almost like little kids learning to ride a bike. From there, a similar story line to 1 where you go back in time to see that big bang and get too close.
3. Keep the Name as is. This would draw from the old ideas of Studios. The first room focuses on how CGI allows us to create the incredible worlds we see on screen. The showcase room includes actual tools and examples of how it's done in modern filmmaking. We then preview Guardians of the Galaxy: Cosmic Rewind, setting it in various stages of development. (Though without the Eson story if I had my choice), and the transport room is Rocket bringing us into the film. From there, we generally go as is. The exit hall becomes a showcase of how the effects on the ride were created.
4. A similar version to 3, but the story becomes how science fiction is created. You'd need to rearrange things a little bit. So, the first room is a more blank box area focused on famous sci Fi in history and it's role. You then go into the preview room where a Disney creator talks about finding inspiration. For example, you could take Epcot, and add the idea of the Xandarians being inspired by Words Showcase and wanting to showcase their technology. You then transport, going into that creation. And the ride plays out generally the same with the Xandarian showcase room coming next. You then have a shorter, additional pre show offering to take you to the planet to see it live, then Rocket offering to pilot you instead, and then a hectic ride through space with the Guardians. And we don't quite make it and come back to Epcot. You then add a post show with examples of inspirations Disney filmmakers used to create ideas from the Guardians films (and beyond).
5. This is total fan service, so I don't think it would actually be viable. But fun for those of us on these boards. You actually lean into the silly Peter Quill and Epcot story. The pavilion becomes the Wonders of Epcot. You first two rooms are actually based on Epcot history and the attractions of the past. The preview room is then a presentation about Epcot that Peter and team interrupt. They offer to take you back in time to"really see the Epcot of his childhood". You board the ships and, as always, something goes wrong - you go back too far. We then dodge the big bang to get back to present day. And, the dialogue has lots of Easter Eggs to lost Epcot attractions (like Veggie Groot Groot, "We're back at the big bang! The ding dang? The piggy bank?"). You could even do the backstage exit gag here with a lot of other references, like a store room for old Epcot things. Obviously, I'd love using old Epcot songs, but the Mix Tape makes more sense for relatability.