Technically, ABC can not activate anything, only miners can, buy running that code. And I do not think miners are so out of their mind to split the chain. They will negotiate more.
I can imagine some pro-Core people waste some hashrate just to create a split
I wish them good luck with their irrational decision to waste money like that. Maybe they can recoup the loss from their cult followers who will buy the coin out of a sense of duty?
