People should remember that whenever FotG sees a release, that for people who decide to create missions for it, you aren't limited to what's in the release. If the FotG team isn't ever doing an Eclipse, but you want one for your campaign, then make it yourself. And yeah, if you're like me, it definitely won't be of the same quality but that doesn't mean you can't still make it.
If The Babylon Project is any indication, there will likely be a lot of people contributing their new missions and their new ships to the abundance of work that the official team has already done. So if you want X ship but they won't make it, and you both can't make it and won't be bothered to learn how to make it, then don't despair because one day, someone probably will make it.
Unless you like some super obscure, random ship or fighter, then you might be out of luck.