Saw writer Patrick Melton gave an interview with UK radio station 107.5 Demon FM and he dropped this bombshell:

“I think it’s going to end with Saw VII. I have a very strong feeling it’s going to end with Saw VII. That’s something we’re debating now. You saw in previous interviews or discussions where we thought Saw VIII would be the last one where we had the first trilogy and the second trilogy and then sort of a grand finale wrapped up in two films. But frankly because Saw VI hasn’t performed as well as we anticipated, the idea is well, why make two movies when we can make one really excellent movie that wraps up as best we can? And it’s going to be in 3D, which sort of adds to the spectacle. So if you had to ask me, I don’t own the franchise, nor do I run the studio, but I have a feeling, a strong feeling that it’s going to be Saw VII which will be also known as Endgame. And nothing’s official yet, but that’s where we’re hoping things will go.”

Guess we’ll have to wait till October 22, when Saw 7 3D is released, to see if it really is the end of the franchise (highly doubt it).

Source: http://www.dreadcentral.com/news/35772/saw-vii-3d-the-final-entry-franchise