It may well be the death blow to the KDF since the KDf is so small and under developed as to have little to hold players beyond loyalty and fandom.
This isn't true. Join a good fleet, make some friends there, socialize, and you'll play kdf whatever ship or costume option you have. The STFs/pvp/nukara&defera missions are the same on both side, so basically it may not change your game.
And TBH it will be difficult to give me a more interesting costume option than the HG Mk XII set. This one is amazing.