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If they could set the system up to incentivize quality rather than quantity, gamifying it could lead to more good edits as well.

I'm not sure it's plausible for Wikipedia, but it seems to work for StackOverflow. That said, StackOverflow does not have any seriously controversial material on it.

The problem with this is it conflates expertise with wanting to play little karma games. They may (sadly) be equivalent on StackOverflow, but in some fields I imagine the experts have better things to do. The wiki would start to reflect experts at the game rather than experts in the topics covered.

a la Stack Overflow, you mean.