There are way too many plot holes and random story changes to keep it going IMO.
They tried to keep it going for as long as possible, if you look at box office sales for saw films you will see it started to go down with the last 3. last years saw did patheticly bad so they decided to end it finally and to go against Paranormal Activity 2 they added 3D and delayed it to after PA2 is released.
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