I loved that movie, damn I need to watch it again. Encountering a world coming from that dead and dangerous world will the next mission of the Survey Corps most likely- when there are no Titans they won't just sit on their hands. Erwin always had his theories why extended expeditions were discouraged but to see the proof will be something else for him.

That sounds like an amazing AU tbh, I'm all for futuristic AUs, modern stuff is always great and I've always wanted to do a modern AU psl.