I don't think we need to expand on Unova anymore than what has been done. The Anime always takes care of the extra Canon that was missing. All the features that are added to the thirds are superficial and in my opinion usually a waste. Its always the same thing recycled with minor changes to the story. There is never really anything to do after the main game as there is never an extended story.
Thirds are usually used to test the waters for new development on a later project. The only Third game I've ever enjoyed was Platinum, but not for anything they added after, it was just the add of Charon and Giratina. The change of Cyrus's base made Galactic seem more BA.
They usually offer very little to the actual storyline. The BEST thing about Third games are always the changes to move sets thanks to Move Tutors.
There are always claims of "OH WHAT ABOUT THIS ONE SCRIPT THAT THEY DELIBERATELY LEFT OUT BUT IS THERE SO THEY ARE ABSLOLUTELY MAKING SOMETHING FOR IT!"
Yes I'm talking about the two hidden attacks Ice Burn and Freeze Shock as well as the God Stone.
Cacophony, Beserk Gene, Gold Leaf, Silver Leaf, Brick Piece. Filler information that was part of a production, an idea, but was scrapped before finalization of the game. Its something that has happened in every generation. Missingno from Gen 1 was left over Pokemon data. Gen 3 is what brought Cacophony which was the original version of Sound Proof.
We really don't need any more for Unova, we WANT more. We want the games to continue on and keep our own personal dreams a float.
I've adopted a, "Unless Gamefreak says something. Do not believe anything anyone else says." Why? Cause of that guy with the Youtube Video that "proved" the Starter Evolutions were "fake", and one guy here swore that Light Types would be official. Although they were wants.
I personally do not want a Third or Remakes for this Gen either. I want them to just go into the next one OR for a NEW change of pace start a sequel to the Events of Black and White. Like how Gold and Silver were sequels to Red and Blue. That is what I want to see them do.