I hope Liu Kang and Kitana can take over as the real bad guys because I'm thinking MK11 is hinting at the Netherrealm being the real bad guys. Quan Chi and Shinnok are rendered useless due to their storyline deaths, meaning Liu and Kitana get a chance to be the top bad guys despite being former good guys.
Kung Lao, Sindel, Smoke, Kabal, Nightwolf, Jade and Stryker are just there like wallpaper. Jax, Scorpion and Sub-Zero weren't around long enough to be long-term evil threats. New additions to the revenants could include Mileena, Rain, Baraka, Cyrax and Sektor since D'Vorah killed Mileena and Baraka, Rain got burned on a stake after being deserted by Tanya, Sektor was killed by Sub-Zero, and Cyrax voluntarily self-destructed to help Sub-Zero and the Lin Kuei get a fresh new start after their infamous Cyber Initiative program was out of control.
Dark Raiden would probably be more of an anti-hero at best. I don't want to see an exact repeat of Armageddon 2.0 again, for it would make the franchise reboot all pointless for nothing, so no Onaga, Blaze, Taven or Daegon as the top baddies.
The reason why I hope Liu Kang and Kitana stay villains is because it would make even the typically evil characters like Tanya, Goro, Reptile, Shang Tsung, Mileena (if she's alive for MK11), Rain and Kotal Kahn (those except Kotal who have previously feuded with Liu and Kitana as villains in the past but now they should probably chip in and feud with Liu Kang and Kitana as more heroic characters this time) gain more credibility as heroic characters even if it's just for the moment. Maybe Earthrealm (except for Raiden's clique) and Outworld could finally put aside their differences and work together to stop Liu Kang and Kitana.