Bro, I've been down with Sub-Zero since day one.
But to be honest, he hit a wall after MK4.
The man was useless to the story.
With Scorpion focusing on Quan Chi, Sub-Zero was left to beat off with second rate characters like Frost and Kenshi.
But I honestly believe there is hope.
We still don't know what happened with Noob Saibot in the Soulnado.
My theory is Noob-Saibot is ripped from Bi-Han's body and becomes a separate entity with no need of Bi-Han.
This lets us have Sub-Zero, Cyber Sub-Zero and Noob Saibot.
Which I hope is the case, because I want to know what Bi-Han thinks of the Lin Kuei (now under Sektor's control)
turning his brother into a souless machine.
This could hopefully lead to a rivalry between Bi-Han, C.Zero and Sektor.
Allowing Sektor to evolve into a major villain.
Win-win bro