Magnus Manske wrote:
So, you could start such a site yourself. But it would be far better to do this on the Wikimedia sites. But then why not integrate this directly into Wikipedia?
Because once you're "hiding" the current editable version of Wikipedia, the site becomes no different from any other up-to-date mirror of our content and the unique editing-focused view that Wikipedia currently has is gone. But this is the same argument I've repeated several times already so I won't go into detail. :)
As a different argument, though, there's the subject of advertising on the "stable" version. I didn't want to broach the subject myself since it's so volatile, but since Daniel already did I'll point out that considering that very volatility it's an option that we could only pull off with a separate project held at arm's length from the main site.