^ They might have been considering recasting Jock, at least for a little while. Jim Davis would have been a tough act to follow, but it's more typically soap opera to recast a character.
Of course it depends on the popularity of the character and how long one person portrayed that character and therefore how much that actor was associated with the role.
Actually... the plan was to make the Ben Stivers character in the "dream season" actually turn out to be Jock after all, but when they resurrected Bobby and Ben Stivers became Wes Parmalee, the writers realized it would have been too much to have two beloved characters return from the dead so soon. So Parmalee turned out to be a fake, and Jock remained dead.