Serious question:
Is it worth the Foundation approaching Google with a suggestion to *penalise* links from wikipedia.org? Not single links, but many links.
I doubt it... It's quite hard to tell the difference between spam links and real links.
Stable Versions are the solution, yet again - have nofollow on unstable versions and allow the links to be indexed on stable versions, that way everyone gets the benefit of google indexing the links, without there being an incentive to add linkspam.