
In his keynote address at DrupalCon 2011 in London, Dries Buytaert made the case that WordPress is not a Drupal competitor. It's a point he first made on his blog in April of that year writing, "While there are things we can learn from WordPress, it is not the competition."
Instead, Buytaert has implored the Drupal community to focus on two other areas. First, he has promoted outreach to the large percentage of websites that currently do not use a content management system at all. Secondly, he has encouraged the Drupal community to learn about the commercial CMS alternatives and help large companies using those systems move to Drupal.
Buytaert makes some interesting points, but is he right that WordPress is not a competitor to Drupal? I don't think so.