The interwiki map is a subject of long and stupid discussion at present - see for a precis. Discussion is at:
http://meta.wikimedia.org/wiki/Talk:Interwiki_map#Inclusion_criteria_clarifi...
Now, the question is: Do we have any way to gather usage statistics for interwiki links? How can we tell when a link is not in fact being used? If a link is to be removed from the interwiki map, how can we be sure to fix the damage?
- d.