Who knows? Who cares? Since Christianity is currently the fastest growing religion in the world, I would expect that no such decline exists worldwide. In Europe, I expect the decline in the number of clergy of all ages has probably flattened out since Europeans have pretty much dispensed with Christianity altogether. In the United States, we have just begun that journey, so I expect the decline here is just beginning.
If not, then what do you attribute it to?
That question doesn't make any sense. If not what?
The United States has begun its decline into a post-Christian society with the social dominance of the children of the 1960s. As the Reverend Larkin pointed out, Satan has been very successful in convincing American Christians that salvation can be found in the government. As well, the vast majority of people born after 1969 tend to be far more self-interested and hedonistic than their forebears. The young lady in the article is an excellent example. All she can think of when she looks at working in the service of God is what's in it for her. I'm sure she'll end up being a good little Social Justice Christian when she comes out of whatever bootcamp she attends. In any case, why would some empty-headed twenty-something be remotely interested in experiencing human misery, pain, and spiritual anguish firsthand when watching TV, playing video games, and clubbing are so much more fun?