What is the percentage of Wikipedia pages that get edited each day (or week, or month), and has that percentage changed over time?
Or what are the number of daily page views, page edits, and searches?
Of course, on the first day, 100 % of the pages were altered... so it would be reasonable to think that the rate of change slowly decreases as a wiki site grows. Is this so? Do wiki pages find their final form, never to be edited again, or at least more and more seldom? Could we get some numbers on this?
Would it be reasonable to update the search index each time a new version of a page is saved? In that case, the search would still be indexed (and fast), but it would always be up-to-date.