'Glee' Ending? Ryan Murphy Eyes End Date

No TV show can last forever ... not even "Glee."

Fox's singing dramedy recently went through a rebirth of sorts as many of the main characters graduated from high school and went on to college. Some of the actors stayed with the series and a portion of the show moved to New York to focus on Rachel (Lea Michele) and Kurt (Chris Colfer). As a result, new characters were introduced in both the high school and college settings, expanding the cast.

In an interview with The Hollywood Reporter, "Glee" co-creator Ryan Murphy said the new characters have given the show new life, but for how long?

"I've really wanted it to go on, and I wanted to populate it with new people," Murphy said. "We did that this season, and thankfully those kids have popped. It's re-energized the show, and I think the actors are all much happier because nobody is having to work eight days a week and kill themselves."

Murphy said the set used to be "very tumultuous," but now that there's more balance, he said it's like "kids in the candy store."

"So I feel like we finally figured out how to make it work, and I think we could get another four years from this show," he said.

Since moving to Thursdays, "Glee" has dipped in the ratings a bit. The most recent episode, "The Break-Up," had about 6.1 million viewers. Prior to the fourth season, there were talks off launching a "Glee" spinoff, but those plans were quashed.

Four more years of "Glee" would bring the show to another cycle of graduation -- high school for the new kids and college for the original characters. What, nobody wants to watch "Glee: Underemployed Years"?

Click over to THR for the entire Q&A with Ryan Murphy.