If the United States doesn't have the pull to put a moratorium on travel we are essentially sunk. How on earth will sending three thousand troops to monitor the borders of Liberia do a damn bit of good. There is no way every exit point from Liberia can be covered. And there are going to be people in the early incubation stages of ebola who appear physically healthy and will be able to exit the country.
i think it's a case of "well, we COULD pull rank and be the big bad USA, demanding this and that... OR we could just watch where the disease is, help out with support, logistics...and yes, if you see 200 people with flesh eating virus getting on a boat headed for elsewhere, maybe you "offer logistical support" and "give them beds" and make sure their asses are motivated to stay right there they are.
I'm not saying it's a big showdown like the movies, nor a need for international paperwork. I'm saying in "giving out beds" you're also making the sick people STAY IN THAT SPOT, since beds don't have wheels. De Facto, not de jure.