Market share of WordPress as website platform in 2011 : 13%
In 2020 : 38%
Yeah, php is not growing. Growing might start to become difficult when you en 40% of the web.
Which of these new websites have large userbase? Anyone can start their Wordpress blog with some limited free hosting and thus increase Wordpress market share. And since internet has grown considerably in the last 10 years more people tried to make their own website. And with Wordpress that is incredibly easy for people who are not technologically inclined.
Sure, websites like TechCrunch, BBC, Playstation Blog or Variety use it but they have done so for a long time. Newer websites/companies are not using Wordpress and maybe not even PHP. Medium runs on combination of Node and Go, Twitch has gone with Ruby on Rails among others, Trello runs on MongoDB and CoffeeScript on the frontend and I could go on.
Sure, websites like TechCrunch, BBC, Playstation Blog or Variety use it but they have done so for a long time. Newer websites/companies are not using Wordpress and maybe not even PHP. Medium runs on combination of Node and Go, Twitch has gone with Ruby on Rails among others, Trello runs on MongoDB and CoffeeScript on the frontend and I could go on.