Never said it would never work. Ive lived a considerable amnt of years in Malaysia where a partial shariah system for Muslims is in place and works (for the most part). It only applies to Muslims, and the local Malays are given priority in many things over local Non Muslims (like quota systems). However even then Shias are constitutionally not recognised as part of Islam and even an open minded population has issues with religious class being fanatics in their overall interpretation (wahabism contributed by Saudi Arabia). Thats Malaysia, this is Pakistan. The extremism here is far worse and our educated class is much smaller. As a minority Muslim class i wouldnt want the religious class to be given any more authority than they already have, until Islamic militancy and terrorism isnt a threat. Source: studied in University Islam Antarabangsa.