Training for the exact same shit that I've been saying that will happen:
Looks like this comment aged pretty well...
Mortal Kombat Zero
Wiping out either side is bad news, besides, that needs A LOT of power, not even Kronika could. And what Raiden did was glorious, but that's what triggered her, and look at the mess.
If NRS reads the previous game when producing MK12, the idea of Kronika's New Era was no Raiden, Shinnok/Cetrion again. This leads me to the idea that in Kang's timeline there's no Shinnok, but it has been slightly implied this means shit, even though we don't know what.
Still, he's training Kung Lao, so there are still threats to Earthrealm. If Outworld attacks again, let's remember Shao Kahn only attacked Earthrealm after Shinnok, and when the first was distracted with Edenia, the latter was still an Elder God by status.
Simply put, they have a lot of s** to build up again, and I highly doubt Shinnok's erasing is permanent. And I don't think Liu Kang's New Era will endure far too long.
In the Shao Johnny interaction he states that Shinnok aint shit pretty much. Which leads me to believe that Shao and Shinnok have crossed paths before. Also, according to canon isn't Shao Kahn an immortal who has lived for a very long time?