I think conversely that Drupal 8 is the swan song. Too late to the party. Everyone who was really unhappy with the spaghetti bowl of code in prior drupal versions has already moved on. Those who have not, are not interested in rebuilding their sites on a new platform. They just want Drupal 6 to keep working. Drupal 8 is not a gentrified neighborhood, it's more like the ghost cities in China: clean, modern, well-desig…
What have they moved on to? I'm investigating CMS's for a client (an task I have entirely no experience with). Is Joomla any better? Or is the whole concept of CMS dying?
You're not going to get an accurate picture of the CMS market here on HN. Most folks here are developers...PHP CMS's are not what they are interested in. The prevailing opinion on HN is something like "CMS's suck, you should build it yourself with node/React" or whatever.
If you need to build a content website, and the information architecture is complex, Drupal is a very strong choice. I haven't use D8 yet, and I would not recommend building a high-profile project on it yet, unless you really want to be an early adopter. But D7 works well and will be supported for a long time yet to come.
If your info architecture is fairly simple, take a look at Wordpress. You'll have an easier time finding low-cost vendors than with Drupal. Drupal is powerful but expensive.