It's been 20 days since Duncan left the apartment where he puked and had diarrhea. None of the people there were infected. Therefore we can surmise that there is little or no risk for the nurses casual contacts, the cruise ship, etc.
OTOH we have 150 new arrivals a day that could be incubating with no symptoms or even be contagious without symptoms. That is truly frightening because they are not Americans, not being tracked, will blend into their respective communities and any one of them could start an outbreak here.
I have no doubt we will handle each outbreak but it will cost millions each time and Americans will die from it particularly health care workers.
Ebola will greatly damage the travel industry in America. Airlines will go bankrupt, trains and buses will be empty.
But the greatest damage will be to the health industry, where doctors and nurses will either die or refuse to work. Hospitals will close due to the financial stresses and the upcoming lawsuits.
As with most tragedies, the only winners will be the lawyers.