Abacab hasn't made the cut in ages. It's unlikely it will resurface now.
I thought Nic said they were rehearsing Abacab at one point? Even if I am recalling that correctly it dosen’t necessarily mean that Abacab made it into the final show. One thing to keep in mind tho is that while it’s been 35 years since they played abacab, that was only 2 tours ago for this lineup of Genesis (3 if you include CAS). And of all the “long dead” songs that Genesis could revive, Abacab is pretty likely because it was a hit (peaking at #9 in the UK & #26 in the US)