On the Arbitration Committee talk page, Michael Snow pointed out that there's two unfilled places on the Committee, due to resignations/places not being taken up in the first place, and suggested that elections for these be held.
In my opinion, particularly considering the slow rate of proceedings of late, and that we are now down to seven active arbitrators (two away, one inactive, as well as these two spots), it would be wise to attempt to fill these.
-- ambi