Interesting circle; WordPress says "Can not abandon old PHP, bc. hosts use this" and hosts says "Can not update, bc. WordPress uses that'.

Sure, a vast group of users one-clicked installation, then one-clicked many plugins without any knowledge. These group will not update, take care of this issue and probably never even know something about it.

Even if WordPress requires low entry barrier, low technical knowledge, in the case of a self-hosted website, it is self-hosted website :) It should be managed with that in mind.

Many users would make a favour to themselves, if they use managed solution like wordpress.com or anything similar.
The same applies to many "hosting" companies, they can do incredible service to "online world" if they leave that business and do something more helpful.