I recently came across a discussion on LinkedIn regarding the longevity of Drupal. Alex, who posted the question mentioned about how the Post Nuke CMS forked into Zikula, which has lost a lot of its past popularity. We can see how the popularity shifted back in 2005 with Drupal leading the way. We can also see some of that trends here with Google Trends.

A lot of other users have posted their views on this. Some have mentioned that Drupal has been around for 8 years, while others mentioned that it is used by a lot of major companies.
My view on this is as follows: