The Cunctator wrote in part:
The content of the Wikipedia pages below the title and above the links at the bottom has always been entirely user-configurable. To change that summarily is not something to be taken lightly.
Persumably you meant Wikipedia /articles/ here, not Wikipedia /pages/, since you already pointed out that Erik's example of subpage backlinks applies only outside the article namespace -- but it does apply to some pages.
-- Toby