http://www.hollywoodreporter.com/live-feed/big-bang-theory-will-season-843830

"I think so,” says showrunner Steve Molaro. But he was quick to add: "The real answer is I don't know and all I can do right now is go episode to episode and try to make each one the best that we can. There's still so many episodes to go. Even if hypothetically season 10 was the end, I wouldn't be focusing on that yet. That seems like something that would be dealt with way down the line.”

It should. The storylines are going strong, but you can begin to see things are wrapping up.

Didn't they sign long contracts a year or so ago, with big $$$$ ?

And that's when I think the show should end.