Sadly, Kerchak is going to be killed off by his wife, who has to become the most monstrous thing in the valley. Shitting the charts are his friends, Tramp and Terra.
Without doubt, Tarzan will sacrifice Kerchak to Mita in order to appease her, no matter the cost. He'll have to go and whack him to death, just as usual. Because Mita wants blood.
Fresh old Blood Is The Way For dead him To Start his Cosmic Void Journey into the afterlife. For many creatures like him, it's a possibility as they'll finally be flying around as spirits.