Ahhh, see for me a sequel would be a "fix-it," at least how I conceive of them! My issues with the Guardian drama ending are primarily because it's the ending. If the storylines were part of a larger narrative, I wouldn't have nearly as much trouble accepting them.

E.g. The Dixing-Haixing separation wouldn't bother me so much if in the end they'd mentioned it as a problem -- that the SID was trying to get the portals open or something, to reunite families separated and such. But instead it's treated like it's the solution -- everyone's got their own sun, we don't need to cooperate any longer, whew! And that's frustrating to me.