These threads are pointless.
Guest characters are NEVER going anywhere. The bottom line is that they sell better than the obscure character people beg for (and then don't play when they're added to the game - see Zatanna). Also, let's not act like NRS/WB are the only ones who are using this strategy. Tekken (and others) are also adding guest characters. At least I care about Joker, Terminator and Spawn. Noctis and Negan have absolutely zero appeal to me.
Having said that, Tekken is also responsible for AMAZING guests like Akuma and Geese.
Either way, nothing will change. If you're that upset about it, stop buying the Kombat Packs before they're announced. I will say that having 3 fucking guests in a 6 character pack is far too much, though.
Lastly, we can pump the brakes on Havik, Khameleon and Sareena being iconic. They shouldn't be mentioned in the same breath as those other characters.