Interesting. I see 2 dimensions here.

1. It is amazing to see WordPress reaching to this stage starting from Blogging platform to a Robust CMS with Social network and eCommerce platform with help of plugins.

2. On other hand, having procedure code, i affraid how far it can go, or developer community can stretch it with plugins. I see a breakdown point in near future, technically.

With Ghost coming in from Node.js and Drupal being the stable CMS with MVC code, i am bit excited to see how much marketing can help against the flexible yet fragile core.