Doomed ? Yes I think it will be unless Firaxis put more development resource in it again. Stability is still going down from what I can see, and so far the current development process prevents any overhaul of flawed core mechanisms. And once they stop development the game will be doomed to stay flawed, unless they release the source code later. civ2 to civ5 survived the end of the development cycle and are still played today, for various reasons*, I don't see that future for civ6 once civ7 will have matured a bit. That doesn't mean civ6 is a commercial failure, it's the opposite, and I suppose civ7 will be an even greater success, being designed to be a consumable like some other game franchise, everyone moving to the latest iteration when it's out. *modding is more accessible in civ2 and civ3 and deeper in civ4 and civ5, while IMO civ6 modding is at civ2 level (which is not a bad comparaison, especially if you ponder the graphic engine) but with a much harder learning curve.