[andix]

There are many good CMSs, no doubt. But Wordpress is the de-facto standard, every theme has first class support for Wordpress. And every thing on the web has a Wordpress plugin.

It’s not rocket science to learn another CMS, but many people are deeply invested into Wordpress and it would take a lot of money and effort to switch.

Even if the popularity of Wordpress decreases now, Wordpress (or a compatible fork) are going to be relevant for at least another decade.

The Wordpress license GPL/Copyleft makes forks rather easy.