While I think these sprints are a good idea, we need to be careful not to turn this into a hunt against old questions. Abandoned questions are questions that can't be resolved without further input from the asker. They are not just "old questions".
For example, this is not abandoned. It may be a bad question for other reasons, but it is fully coherent, has all requested information in it, and could be addressed fully even if the asker dropped off the face of the earth (which he hasn't).
Moral of the story: this isn't a game to purge questions that aren't answered from the system. It's a game to purge questions that can't be answered from the system.