I think we have diverged a little from the original debate into a bit of a dick swinging contest, and whilst I still agree with a great deal W2P has to say, I do think that reality these days can be a bit different, and CRM must be that much better when flying at night. In the old days when I flew Lynx, it really wasnt much of a problem to land x-cockpit, and actually it was also possible in a (but difficult) Puma, but definitely not in an S92, difficult in a 76, and I am guessing also very challenging in a 139. Here is where the problem begins. In an aircraft with good vis, it is a lot easier for the NHP to spot when things are going wrong. As we all know, it can go wrong very quickly, especially with disorientation, and it can happen anywhere, including very close to the deck. It can also take some time for the pilot to recognise this, and in certain circumstances, that can be the fatal factor. Now, if the captain cant see what is going on, the co-pilot (or other way round) is slow to recognise the problem then things get a lot worse, very quickly. I have experienced disorientation myself at night, during an approach, so I know how quickly the picture can go from perfect to completely wrong. The worst one was on relatively short finals to a deck, marginal (certainly not bad) weather, with fairly good viz. I have done 1000's night decks/CA's/mountains. I was lucky enough to spot it fairly quickly and didnt press on, and went around. This is definitely not always the case. I have never been disorientated the same way during the day, in any conditions.
The simple law of averages will lead you to the conclusion that after x number of SD occurrences sooner or later one will go wrong. Can you train for this? Yes - maybe to a certain degree. Will it happen again? Yes definitely. Will it cause another crash? Yes very likely. How do we avoid it in future? Improved technology (approach systems), better CRM procedures, SD training, better cockpit design, better deck design, finally - dont fly at night. All cost money - fact. Which is the cheapest? I dont know, but if nothing is done I suspect we will see more aircraft crash whilst flying to decks at night.