Only considering the confirmed so far, we have a healthy mix, except for 3D guys which we might get as DLC.
People complaining about the classics, you need to think we got Baraka, Kabal, Skarlet ,probably Noob and Jade, maybe Rain. All of those are underdogs already.
One thing I don't see anybody mentioning about the kombat kids, is by the end of MKX, Jacqui and Takeda were outside the temple wishing for a vacation, quite hurt.
(Might not be indicative of course).
Kung Jin was the one with Cassie. Besides, they might want to keep him for representatiom. If we get two, I would actually bet on Kung Jin.