I thought Mokap was deconfirmed recently. I don't think they will remove Liu Kang, this is not MK without him.
It's not MK without Scorpion or Sub-Zero.
Liu Kang as stated is a character Ed Boon nor John Tobias, nor anyone at Midway and Netherrelm liked at any point. He was just there to fill up the designated protagonist role.
Only saving grace is that he's better at that role than Shujinko and Taven. Which isn't hard to do.
But Cassie Cage seems to be taking the protagonist slot. So Liu has no point being here.
Only time he was a good character was in the first movie anyway. Any other time he's woefully boring.
Also Johnny Cage was the protagonist of MK9.
Obviously.