Believing we’ll go on forever is one of the cruelest tricks humans play on themselves. Such a mindset seduces us into delaying tough choices, putting off the things we meant to do and say until tomorrow and tomorrow and tomorrow. Deceiving ourselves that way is foolish; using that lie to string along our loved ones is pitiless. “Succession,” for its part, has been upfront as to where Logan Roy (Brian Cox) was steering his family’s ship from the first season when the 80-year-old Waystar Royco CEO emerges from suffering a hemorrhagic stroke and trumpets his intent to remain on the throne. Instead of establishing a succession plan, he continued taunting and goading his children into hating each other and despising him. It looked like it would go on that way ad infinitum. But nothing lasts forever. All great series hit a point that firmly establishes the end has begun. Only “Succession” would be gutsy enough to hide that pernicious alarm in cake and champagne. Sunday’s episode, “Connor’s Wedding,” doesn’t show any signs of Logan slowing …