I agree. Some degree of risk will always exist for the reason you cited. The extent of risk society is willing to tolerate is a policy choice. Resource allocation that gives greater weight to ensuring an inventory of certain equipment and training for critical personnel can mitigate the risk, even if one is dealing strictly with a reallocation of existing resources.
I don't believe it is feasible to expect every hospital to have such a capacity. Having at least one hospital with such capacities in defined regions is more practical. The U.S. needs a coherent response strategy for such a scenario. That does not mean that every medical facility would play leading roles. One might envision a scenario where, in the case of a pandemic, certain medical facilities would take on patients with routine health issues to free up space at designated critical care institutions assigned the leading role for combating a pandemic.
Overall, the early experience with Ebola in the U.S. has exposed some gaps. Remedying some of those gaps does not really require significant new resources. For example, the CDC's communications have been somewhat sloppy. An emphasis on sticking only to the facts, refraining from making sweeping or overconfident statements for which there isn't sufficiently strong evidence to sustain them, etc., could have avoided many of those early communications-related issues. The CDC can ill afford to the lose the public's confidence concerning a virus that quite frankly the U.S. public poorly understands. Already, at least some media outlets seem to be treating what is still an extremely limited incidence of Ebola in the U.S. as a sort of emergent and inevitable epidemic. Such coverage has dissected the CDC's early statements and seems to have created excessive anxiety.
Personally, I don't think Ebola is going to wind up being a big problem in the United States. Even with the issues that have occurred, the U.S. is vastly better prepared to deal with Ebola than the West African states at the epicenter of the outbreak. Superior resources and infrastructure make a world of difference.