All very fine in theory, but it is most unlikely the captain will happily relinqish his command authority to the first officer without a physical altercation in the cockpit. Few operation manuals ever publish exactly how a first officer will physically take control from the captain whose hands are already on the controls.
I agree, but one only needs to "pull" a bit further to the other side to try and get a change, i.e., high rate of descent because of being high? Then:
Well on the 'Bus if the AP is in and the FO pushes the levers forward it's going to go-around which would be difficult to recover from and continue an approach so best to just go with it.
Attaboy
It is a really hard concept and also a really hard thing to do as a young first officer against an experienced captain. But as I said, a wrong is a wrong, no matter who makes it.