I think we're slowly reaching the point where we already have a model of almost every important Star Trek ship, ever. It's actually kind of amazing. I don't see any major ones missing anymore, only some minor ones like maybe the T'Plana Hath, Degra's ship or something like that.
It's almost amazing how many ships we got, and what spectacular quality most of them had! Sure, there were some issues, window alignments, missing details etc. But I doubt we ever got (or will get another) such extensive collection with almost all ships being SO amazingly correct proportions and details, and every two weeks no less! I think of the repeats (like the Ent-A, or the new Nebula) like of some filler-episodes on the show: Where Kirk had another fight to the death for some aliens amusement, or had to reason against another super computer. These slots just needed to be filled with something, and the result is still pretty great, even if it didn't meet all expectations.
I had originally hoped they would add the Discovery-ships to the line. But I guess it makes more financial sense to start a new line for that. The only real misgivings I have about this collection is that the shuttles aren't regular models in regular size with regular prize. I would have bought some. No interest in the shuttle sets though.