Michael Snow (wikipedia@earthlink.net) [050522 10:19]:
The possibility of rewriting content we're unable to relicense is interesting to consider. It strikes me that one potential use for Magnus Manske's article validation tool would be to flag revisions when an article has been rewritten so as to remove the content that we can't secure permission to relicense. But anyway, if people are serious about actually relicensing, the longer they wait, the harder it will be.
In practical terms, I think it verges on the negligibly likely. Mozilla only relicensed because a lack of GPL compatibility was hurting their interactions with others and embeddability; I can't see Wikipedia wanting to relicense without an imminent pressing need to.
- d.