2006/9/7, Tuvic tuvic.tuvic@gmail.com:
Whatever you do, interwikilinking will be totally (and really totally) broken for the year-articles, and will probably take years to correct it. In my point of view, this is the most significant reason to not move the year-pages.
That's much less work than you think - if I set my interwiki bot to work on it (it already has settings for it, actually), I will have things fixed in about 2 days. Although I would suppose that some languages would get angry with me for flooding recent changes....