Since the beginning, Kripke has compared Revolution to Lord of the Rings. Sword fighting, medieval economy/government, lack of modern conveniences, crossbows -- you can kind of see it if you squint just right.
Now, we have a quest for a Tower and the nanites becoming indistinguishable from magic (in the last few episodes, we've seen the nanites heal people -- or rather, keep them alive -- and set people on fire).
I predict that the show will NEVER turn the lights back on (the entire "high concept" of Revolution is what happens after the lights permanently go out) and we'll see the world become more "high fantasy." More nanite magic, less bullets. More Game of Thrones, less Jericho.
That's my guess, anyway.