How will Jehovah make corrections given that He is not directing the GB?
A JW would say that Jehovah does direct the GB. It's just that they're only human so they make mistakes. No big deal.
a child needing a blood transfusion now to save their lives and the
parents have just read that WT study article that the GB may get
doctrines wrong. How can they obey them by refusing a blood transfusion
when the GB MAY be wrong about their interpretation of the meaning of
that scripture about blood?
Very logical, and I wish the admission would lead every JW to start thinking for themselves. But JWs almost never think in terms of specifics like this. The GB may be imperfect, but JWs think that they themselves are far more imperfect and that Jehovah doesn't want them to question what his faithful and discreet slave currently teaches. They think that the GB are refining things and correcting their misunderstandings more and more as Armageddon rapidly approaches.
A dub can turn round and say to an elder "Is it wise to obediently
follow 100% what the GB says when they themselves admit they can be
wrong in matters?"
How many JWs would ever say such a thing to an elder? That type of "independent thinking" is seen as satanic and invites a JC.
To say, in print, the GB can get it wrong means if anyone
follows it blindly and obediently then it is just the same as other
religions in that they are following men.
JWs will vigorously deny that they are following men. They will fall back on the basics they agree with -- no hellfire, no Trinity, no collection plates, neutrality, etc.
And to follow it blindly just adds to the fact it is indeed a cult.
That sums it up in a nutshell, and it explains why most of us on this forum parted company with "God's organization." Unfortunately, the vast majority of JWs don't or won't see it.