The Big Bang Theory has done what few shows on television have done before: It has actually grown in viewership since its first season by more than 10 million viewers — and it keeps getting bigger.

But how long can this roller coaster last?

"Not to make any predictions whatsoever, but in as far as the lifeline of most shows — at the seventh year, obviously, we're over the halfway mark — I personally don't feel like we've told half the stories that these characters have to tell," star Johnny Galecki said at Thursday's Warner Bros.-hosted Emmy panel on the Bangset, moderated by TV Guide Magazine's Rob Moynihan. "I'm certainly not halfway through personally working with all of these people, so I hope [to continue]."

"The answer changes after every season," executive producer Bill Prady told TVGuide.com after the panel. "If you'd ask the question after Season 4, you'd say, 'Boy, it would be great to get to Season 8.' But then you have a season like last year and you say, 'Well, maybe there's more to it than that.' It's possible to keep going because everybody likes each other and no one has gone crazy and no one is mean."

http://www.foxnews.com/entertainment/2013/08/16/how-long-can-big-bang-theory-go-on/