Where's the "Fuck No" option?
Look, he's a cool character concept and all, and would probably fit well in this new dark and brooding atmosphere X seems to have, but he's just not significant enough in the plot to validate a return, just like Sheeva, Baraka, Reptile, and to an extent Mileena and Ermac. I fucking love Ermac, but yeah, all he is is an enforcer. Kano's just another minion for hire. That and he's (I'm assuming) already in his 30's in MK9. So having a 50 something year old Kano would just be weird.
I'd say the most you can hope for is a cameo, because I doubt they'd have him not be mentioned again by Papa or Mama Cage.