The frame of the question is essentially "who will be the dictator who can fix things if one is needed". This frame is inherently anti-American, and also, deeply counterproductive.
It is firstly, and most importantly, anti-American because it supposes that the default state of things is order and control, that liberty and a free society are conditions that must be suspended when order and control are in jeopardy. The "resting state" of the United States, however, is not tyranny, but rather, freedom. Importantly, there is no provision in which the "resting state" in some way changes to "tyranny". That idea is deeply preposterous. Even if the country was in the throws of a world-ending pandemic, we are still a nation governed by the supreme law of the land - namely, the Constitution, Federal Laws, and treaties appropriately made and ratified. This doesn't change in a time of crisis. It doesn't change in a time of need.
It is a deeply disturbing character flaw on American that so many citizens reduce themselves to half-retarded infants in the face of danger. After Sept. 11, 2001, it became fairly obvious that the rational exercise of faculties was suspended without question by large chunks of the public. A widespread Ebola outbreak could lead us back to that infantile state once again.
The question is also deeply counterproductive because it assumes that having a single point of authority will be helpful. Turning over authority to deal with a large problem is not the way to solve difficult problems. Doing so will ensure inefficiency and increase the odds of failure. There is a role for national policy making (which should be done via our elected representatives, acting in concern with the Executive), but it is not to assign authority to a single person for whom all solutions or failures will flow.
As Americans we have many stupid ideas that make it into policy, and granting power to a single person or even a small group of people just increases the odds that something stupid (and deadly) becomes official policy. During hurricanes, and extended power outages, we have idiots governors and attorneys and local government officials arresting and charging people with price gouging for bringing in generators and selling them at market prices. They would rather deny the realities of the iron clad laws of supply & demand and have no spare generator capacity, than have more people with generators who paid higher pricing. The ideology of fairness trumps the realities observable in nature. This and thousands of other outrages upon liberty and nature happen without constraints when Americans turn off their brains and give in to the instinct to obey authority at all costs.
One of the many hidden design advantages of the American system of government is that we have a redundant array of independent actors. There is no central fount of power, from which authority flows. Instead, people act on their own, in their own interests, under the constraints of law established by representatives. In a crisis, especially a large one, this is more workable than a centralized authority. A layered model of decision making and authority creates a mesh that is efficient at transmitting information about successes and failures, and is resilient to localized problems. There are no great success stories of the Federal government handling nationwide emergencies and problems. In past regional problems we have seen systematic problems from mass information loss, inefficiency, and communication failures. These are problems that have solutions, for sure, but they are not universally solvable. The premise of a "czar" is that a single forceful person can reconcile the many uncertain states and create order from chaos. But it is implied that this is inefficient - the implication that moving fast is better than not moving carefully is only true for a limited subset of problems.