I’m sure the answers to these questions will differ depending on everyone’s tradition and personal experience.
Being for the most part a solitary eclectic, I won't necessarily say there is no place for clergy within my path, but I will say that the place of clergy, if such ever solidifies, will be rather unimportant to general following of the path.
I agree with what Juniper said (we don't need anyone standing between us and the gods), so I see the place of clergy as being there to train initiates until they are ready to take responsibility for their own "walk."
In general, I am nervous about clergy in any position more formal than "teacher." When clergy become more authoritative than teacher (which is a position with plenty of authority in its own right), the system is opened to too much risk of corruption (power corrupts).
There are practitioners who
need clergy, I'm simply gun-shy of them, myself, due to my own bad experiences.