but my gut tells me that a witchhunt for homosexual candidates
I agree that there should be no WITCHHUNT, but the Church most deal directly for positive affects with the active homosexuals already in the priesthood. Having many a priest friend and knowing what they know; believe me, they know where the trouble is. The bishops know where the trouble is. Its a matter of "do they want to deal with it". I don't think they have any choice any longer.
PS: LOL! and they won't need peter-meters to resolve the majority of the problem.
The problem is deep -- and you're right, they all know who's who -- but it's not so complex that I have a problem drawing the line at ousting active homosexuals. (Out of Christian charity, I will withhold my remarks on the ephebophiles.)