There's no compelling reason to make this post a community wiki.
The argument that it would make editing easier has very marginal traction I think, since anyone can suggest an edit and the Suggested Edits review queue is very fast moving (moreover, the person who last edited it to add their card does not have enough rep to edit CW posts without review, so it would have made no difference to them or to reviewers if the post were CW), and lowering the bar to edits being audited is not a particularly good idea in my opinion - we check the quality of edits for very good reasons.
The post does not have many possible answers (in this blog post on community wikis, Grace Note argues that, while there is very rarely a benefit to making questions community wiki, the status could be used to suppress a post that is growing out of control) and is now protected to prevent '(me too|thanks)!' answers being posted. The proliferation of similar answers is mainly due to another question having been merged into this one, and new, bad answers are not appearing.
The question author and people who have answered have not expressed any wish to make the post a community wiki and would be, in one stroke, prevented from gaining any further reputation from it. I don't think suppressing reputation gain makes any sense as a reason to make this post community wiki, and the affected users may well be upset.
