I don't see why the order of deaconess could not be restored. There seems to be some debate on if deaconess were ordained in the same sense that male deacons were. Arguments for the ancient order of deaconess don't change the fact the women can not be ordained as priests or bishops.
It doesn't need restoring, per se, in all of the Churches, as it never ceased in many of the Syriac ones. Women singing in the choir in the Syriac and Chaldean churches are supposed to be ordained deaconess; Bishop Mar Ibrahim recently ordained another group deaconess before his retirement.