No doubt there are many contributing components. I don't disagree with your comment, but I would put it another way - the priesthood reflects the population they are from, or in other words, we get the priests we deserve.

I still think the most important factor, at least the one the individual men can actually make a dent into, is that men as a whole are too enslaved by sin to lead as Christians. You just need to look at this forum to see multitudes of men defending their own enslavement by pornography, masturbation and fornication (sexual sins are probably to most easy to fall into, especially for men, which is why chastity is a universal virtue). At a first step, individual men need to choose not to sin for their own sake, i.e. their own personal salvation, and once they start doing so they can step into the role God intends - to lead their societies according to His law.