Hi there,
I'm a writer from the German Wikipedia, but not usually concerned with politics or administration, so forgive me if I understood something incorrectly. But to me it seems that there is no way to not use this feature - it seems more like a new policy.
There are communities in Wikipedia around articles that belong together thematically. Those communities watch over them, but the articles are fairly complete, at least as far as the current community is concerned. Most edits, excepting vandalism, are miniscule. If such a community now decides it does not want to flag "its" articles, because they'd rather work under the current rules, then they should be allowed to do so.
As it is planned, the feature is simply too intrusive. Once an article is flagged as "sighted", there is no way back. It effectively forces the community to keep on flagging, because otherwise a years-old version, that may even have been flagged erroneously, would be shown to anonymous readers instead of the current one.
I know many authors in the German Wikipedia, who see this issue in a similar light: the whole editing process is becoming more complex, but we are not getting any new writers for our article-communities and the existing writers aren't getting any smarter because of flagging. Most of us are unpolitical and even agnostic of most software features and/or administrative processes - we just want to write. So don't shove this feature down our throats. I think it is an interesting idea and may well work, but it should be in effect for article-communities that want it and can handle it, but others should be allowed to take a more conservative approach.
Therefore I think we need a way to unflag revisions or change the "anonymous users don't see the current version if unflagged" rule for certain pages.
Ulrich