‘GoT’ and ‘Big Bang Theory’ finales highlight shift to fewer shared TV experiences

(CNN)Two major hits, “Game of Thrones” and “The Big Bang Theory,” are signing off within days of each other. Whether those shared viewing experiences represent a celebration or a wake is once again the subject of debate in TV industry circles. This discussion is hardly a new one. Each time a major hit goes off the air — “The Cosby Show” in 1992, “Seinfeld” in 1998, “Friends” in 2004, “The Sopranos” in 2007 — there seems to be a new round of speculation regarding whether TV has crossed a bridge into what amounts to a smaller, more dispersed world. When “Seinfeld” ended, the late Larry Gelbart — who developed “M*A*S*H,” still the most-watched series finale ever — cited the value …