Apparently, Vassyana has retired his arbcomship.
What could be the reason?
You're several days late, but the reason is given quite clearly here:
http://en.wikipedia.org/wiki/Wikipedia:Arbitration_Committee/Noticeboard#Vassyana
He seems to have other real life commitments. Either that, or he just didn't want to deal with the massive amounts of work they do. Well, good for him then.