Is interest in Wikipedia slowing down?

According to Robert Rohde, editing traffic on Wikipedia is on the decline:

Since early this year, and for the first extended period in Wikipedia's history, the activity rate of the Wikipedia community has been declining. This can be seen in the rate of editing articles (-17%), the rate of new account registration (-25%), blocks (-30%), protections (-30%), uploads (-10%), article deletions (-25%), etc. Some exceptions are the article creation rate (+25%) and image deletions (+80%), but overall the community appears to be doing less now than it was 6 months ago.

via TechCrunch