OK, this is a stretch - Imagine the co-pilot frozen in a position with his hand weighted against the toggle, unable to lift his arm, perhaps only being able to use some upper body motion (limited by seat belt) - or - completely incapacited because he was stroking out.
Perhaps the airlines will consider modifying the safety devise to accept a sequence of codes to over-ride that toggle for this kind of emergency, where two or more crew members have separate codes that must be entered in a rank sequence to break the security lock triggered by the cockpit's toggle.
“If the co-pilot suffered a stroke”
The co-pilot had to be awake to keep re-securing the door to prevent the code from working.
Yeah, and pointless to add complexity for the 1/1000000 event which can can create new problems or vulnerabilities.