Lubavitch is a different case. A dynastic sect needs a "king", one head of the group, and the Lubavitchers were in desperate straits do to the failure of the late Rebbe to prepare a successor. For the Mithnagdim Ultra-Orthodox, there does not need to be a single head (Posek), although it is convenient. It wasn't so historically, because every locale ran by the decisions of the local rabbi. With today's global village situation, it is possible to form some High Beth-Din, a group of a few recognized sages who will decide by majority vote what the flock should be doing.
Syrian rebels threaten to shell government forces if prisoners' demands not met (Reuters)
from the article: The leadership vacuum facing ultra-Orthodox Jewry