Well decentralization is mostly a sham in its current state. You think people will care about Block.One's Voice app? Steemit more or less died. Hacker Noon got greedy. Wordpress blogs are dead.
Are you sure it's not your reading habits that have changed? For example, I wake up and check my RSS reader (feedbin) where I subscribe to hundreds of individual blogs (many powered by WordPress). Actually this article was in my feed because I subscribe to HN RSS with a "Blog" keyword filter!
I don't have numbers but my anecdotal experience is that more blog articles I read are on WP blogs than not. Ghost is probably the other major platform I see along with static site generators.