My problem is the mandate of the cc-wiki by attribution license, when cc licenses are not intended for code. A pessimistic reading would appear to restrict even reimplementaitons of answers.
Of course, the main problem is that individuals should be able to license their contributions as they choose.
You can relicense your own contributions as you choose, as long as it's at least as permissive as cc-by-sa or you dual license your code under cc-by-sa. Just mention your license in your user info. I license all my code samples under the WTFPLv2.
Also, it doesn't matter for most code sample on there. Most are not anything you would want to copy (too specific, or too general, to apply directly to your problem), or short enough that copying them would be considered fair use.
Of course, the main problem is that individuals should be able to license their contributions as they choose.