The title of the finale is a play on both a scientific concept and a psychological one. In the context of the episode:
The essay of these episodes serves as a "thank you" to the audience. By ending with the group eating takeout in the 4A apartment—the same way many episodes began—the show suggests that while their lives have changed (marriages, children, Nobel Prizes), the core of their friendship remains the "constant." The Change Constant / The Stockholm SyndromeThe...
The "Change Constant" refers to the scientific and philosophical idea that change is the only true permanent state of the universe. For Sheldon, accepting this is his final bridge to true maturity. Part 2: The Stockholm Syndrome The title of the finale is a play
The title suggests that his friends have, in a sense, been "hostages" to Sheldon’s eccentricities for twelve years, staying out of a complicated kind of love and loyalty (Stockholm Syndrome). For Sheldon, accepting this is his final bridge