So, when someone argues that only one or two brief sections of the PCA BCO need to be changed to accommodate women as ecclesiastical authority, they are simply ignorant of their constitution.
So would it have to be fundamentally altered? I mean how much would have to change, can you guess? I mean if its a lot than just say that.
It would be substantial and wide ranging, because it would not be historic, biblical Presbyterian polity at all.
Above all else, Presbyterians have majored on (good) biblical polity.
Consider the Northern California Overture in 2010 (which was declined at first hearing):
OVERTURE 10 from Northern California Presbytery (to CCB & OC)
“Amend BCO 1-4, 4-2, 5-10, 7-2, 9-2, 9-7 & Add a BCO 9-8
to Appoint Unordained Men and Women to Carry Out Diaconal Ministry”
That Overture proposed changing six(!) sections of the BCO and adding a new section. So, 7 different parts. And that just gets started.
Those arguing that just adding or deleting a phrase in one or two places is all that is needed simply misunderstand (and misrepresent) historic Presbyterian polity, and that of the PCA.
Same goes for those using reasoning that Deacons are not really officers, anyone who "helps" is a Deacon, and that there is not any authority in the office of Deacon, because it's not really an office.
Yet, historic biblical polity (and that of the PCA) recognizes that the authority of the office of Deacon springs directly from Jesus Christ to govern His church, just as the authority of Elders, Ministers and Bishops does.
PREFACE TO THE BOOK OF CHURCH ORDER
I. THE KING AND HEAD OF THE CHURCH
....
It belongs to His Majesty from His throne of glory to rule and teach the Church through His Word and Spirit by the ministry of men; thus mediately exercising His own authority and enforcing His own laws, unto the edification and establishment of His Kingdom. Christ, as King, has given to His Church officers, oracles and ordinances; and especially has He ordained therein His system of doctrine, government, discipline and worship, all of which are either expressly set down in Scripture, or by good and necessary inference may be deduced therefrom; and to which things He commands that nothing be added, and that from them naught be taken away. Since the ascension of Jesus Christ to heaven, He is present with the Church by His Word and Spirit, and the benefits of all His offices are effectually applied by the Holy Ghost....
Those who devalue the office of Deacon to have men and women serve without distinction as mere "helpers who do mercy" are really attacking an appointment that comes from our Lord Himself. They are undermining the doctrines of ordination and vocation, and the authority of church office- all church offices.
They may say, for now, they are not challenging the office of elder, but really they are undermining every authoritative position in the Body of Christ with imagined human notions of governance.
We must pray that does not happen in our generation, as the saints who have gone before us prayed in theirs.