O’Brien’s departure feels like the end of an era for late night TV

Photo by Bob Smith from FreeImages

Conan O’Brien bid farewell to late-night television this week (at least for the moment) and in many ways, it feels like the end of an era.

He debuted late in the world Johnny built — 1993 — as the replacement for David Letterman. The “Late Night” host, long considered Carson’s natural successor for the “Tonight Show” gig, had just been “Leno-ed” and…