>Second, not everyone is equipped to earn a PhD by significantly advancing our knowledge in a useful field. In fact, the majority of people are not.

And even if equipped (whatever that means exactly) many simply have no interest in doing so. I assume I could have gotten into a PhD program of some sort had I had my heart set on it. (I did get a couple of Masters--and mostly quite enjoyed them.) But had very little interest in getting a PhD--and find the idea retrospectively even less appealing today.