> I don't think fewer people self-host. There are some going to big clouds, there are some using integrated offerings like squarespace, but there are still many hosting their website with a regular hoster. And probably in total many more than in the past.

From my experience, the share of people who can only deploy PHP is steadily shrinking. PHP remains the default, and popular, but easily deploying other languages is becoming more feasible, and we're shipping docker containers with Python/Go/Node/whatever code a lot more often these days.