Rather than being overly-sentimental about this, I encourage all serious Gundam fans to think about this for a moment: With no animated series since SEED Destiny, no official comic series being publicly released, and otherwise no comments from Sunrise or BANDAI with relation to the stories and characters of the Cosmic Era, has the world of Kira Yamato and Athrun Zala been thrown into the garbage?
Truthfully, nothing is really disposed-of when it comes to BANDAI, Japan's leading toy-maker, so there's always a chance for Cosmic Era-type series to make a comeback. But I question whether or not this is like saying that "After War-serieses have a chance to be made someday." The reasoning has come because of a number of items:
1) Gundam SEED Destiny was junk.
2) Gundam 00 is aesthetically akin to what Cosmic Era serieses offered as well as being stronger in story and character design.
3) Cosmic Era serieses bear the unflattering title of being started from a story so much like the Universal Century's beginnings that producers would equate the creative results of a new C.E. world to a new U.C. world...while lacking the continued fan support of the latter.
4) The fickleness of Japan's entertainment industry, combined with lackluster economic conditions, means that producing an expensive work of animation for a fanbase which has effectively emigrated to Anno Domini would be foolish.
5) Previous attempts to raise the respectability of the Cosmic Era using video games and movie versions of animated serieses failed to accomplish any notable results.
All this being said, don't get me wrong. If I was offered the choice between a new Cosmic Era series and a new Anno Domini series, I would choose the C.E. option because, as a fan, I am closer to the characters and stories therein. Nevertheless, if the realities mentioned above are true, it is very likely that the Cosmic Era has been placed in the same 'discard' basket as Future Century, After Colony, After War, and Correct Century, left to be used whenever someone feels like it, but never to be on the same level as Universal Century or the currently-promoted series.
But with this, someone might very well disagree with my statements herein; the popularity of Cosmic Era series dominated the Gundam franchise for more than five years, surpassing any other non-U.C. worlds in the history of Gundam; this is no simple compliment, and as such, if Anno Domini were to fall, could Cosmic Era be seen as a potential replacement even after its previous results?