In a company I once worked for the FO was taught (and practised in the sim) to continue to complete the autoland as long as the FMA still indicated the aircraft would do it.
The alternative action (i.e going around) was discussed and when the FO realised that he (she) would now be faced with an unprepared single pilot diversion to a destination that now had to be Cat I, with a medical emergency, the 'risk' in completing the autoland was now regarded as significantly being the lesser of the two evils.
The important thing was providing the FO with the opportunity to practice.
The importance of both pilots completing their SOP calls was also promoted as being the primary clue as to whether incapacitation had occurred.
Hope this helps......