I also think so... But your theory is really interesting.... and I would love another offspring character....
There might just be another offspring char...
I have a theory that the 'main hero' or secondary main hero of MKX(which i dont think has been revealed yet or i may be wrong) could be an offspring char...like the offspring of the BIG BAD Villain...who I believe is gonna be Liu Kang.
Also although it is too early to tell, If the Main hero is an offspring of Kang, Boon probably wont reveal that until he reveals 'Evil Kang' or they both will be revealed at the same time. because revealing kang/kits's offspring before kang is revealed would spoil the "surprise" for Kang's return after he died in MK9. AGAIN this is all in theory. Plus I dont see them making an offspring for Sonya and Cage to represent their legacy in the next GEN and not for Kang. So I kinda do want to believe that we may see a Liu/Kitana offspring. and that this offspring may be the REAL Next GEN Liu Kang and possibly the one to stop his evil father...yea some star wars shit...but thats what i sense. Especially with the parallels between Raiden and Kang and Anakin and Obi wan in MK9. But this is just me and my theory.
How I come by that theory is because Boon did say something about seeing old faces again and we all know no one stays dead in MK...especially not the popular ones like Scorp, Subz, kang etc.
Now This Sub Zero theory in my mind is that this shown Sub Zero is Bi Han.somehow he is cleansed of Noob And this encounter between him and scorpion could take place at the beginning of the MKX story which MAY cover MK4. Boon also said that the story begins right after MK9 and everything is in a 25 year span.
If Cage and Sonya are in the game, they may appear at the beginning still young and fighting shinnok IF he appears and they cover MK4. Then the story will pass time by and we will see new chars and offsprings and older versions of Cage in Sonya and possibly others in a new story.
If the MK4 stuff does happen, somewhere in all that(perhaps at the end of the MK4 arc) we may see revived chars: Liu Kang, Kitana, and all those who died in MK9etc.
If this happens, there is reason to suspect a cyber kuai could in this game. A Human SZ and CSZ just like last time.
This also reason to suspect a Liu/Kitana relationship to really kick off(as with sonya and cage) and an offspring(or 2, ya know twins-luke and leia) to happen- as 25 years is a sufficient enough time for them. I think that somewhere in all that, Liu gets corrupted of taken over or something similar to his MK9 ending and he could become a corrupted god.
Either Raiden or Liu's son(as i dont see a female lead protagonist in MK happening) will fight Evil Kang. Because if Kang is the Big bad, someone who is of some kind of relation to him or is affiliated with him is gonna be the one to fight him. I dont see Cassie fighting Kang at the end. I dont see Sub Zero fighting Kang at the end, and I dont see Scorpion fighting him at the end. I see either raiden fighting kang, or kang's son fighting his father...OR the Kahn guy may be involved with Kang. who knows?
I still have yet to see raiden, who is also a suspect as a BIG BAD...however, an evil raiden is nothing new... we've seen raiden go off the deep end kinda and become dark. And I thought Boon said "a
Surprise return char from the previous game"... We know raiden is gonna be back in one form or another, but dark raiden as Big Bad would not be as much of a shock factor than an Evil God Liu Kang. That shock factor would be extremely HIGH, as it was in MKL2. This is more of the reason I suspect Kang as the Big Bad(then my other theories about the main hero comes from that.)
Again this is all my theories...i could be missing key plot elements that totally throws a monkey wrench in this and if so let me know...but, We'll see...