Some things to consider about the CSZ dilemma -
Along with Scorpion, Sub Zero is now the face of MK. To me, making him permanently cyborg is like making Scorpion permanently cyborg. It's just wrong. Is Cyber SZ a good character? I think so, and I think most fans can agree he's at least well-made. But he's still not the iconic Sub Zero.
Noob is also a huge success in MK9, and I can't imagine him not being brought back in MK10. So out of the three, the character with the least chance of returning is CSZ. IMO he was made primarily because of the huge demand for Human Smoke, and exists to fill the third cyborg slot from the timeline that MK9's based on. He simply isn't needed for MK10. The most likely outcome I can see is Kuai Liang being ressurrected back to human form.
Anyway, NR are in the best position to decide if they want to bring CSZ back or not. Based on his popularity, they can either find a way to include him in MK10, or simply leave him back in MK9. No matter what though, I can't see the next MK game without a human Sub Zero. It'd be a monumental mistake to leave out that one.