Rubel argues
that Google's AdSense has made text ads so ubiquitous that users are becoming blind to them -- essentially driving CTRs for sponsored links way down. (Sounds oddly familiar to what happened when the
Web became full of banner ads, right?). Together with decreasing or flat conversions (not just CTRs) and the influx of video, some would say that this signals the death knell for paid search
advertising.
As usual, the best talking points come up in the article's 60+ comments.