It's coordination problems and large scale distributed action, not some moral character of how serious the people are. Effort is not fungible. To make php good, you only have to act at one point, in a localized way, at the php foundation. To ditch php, you have to act in a coordinated way across any resource strapped companies and individuals. Just see how hard it was to ditch Python 2 or how ipv4 is still not ditched.

Trying to understand underlying reasons and incentive structures is much more productive and useful than simply venting about the worse moral character and seriousness of people in one industry vs the next. Curiously, the grass seems always greener - when you ask people in other industries, you'll often hear endless complaints about the state of things there too.