in order to stay viable, the virus needs to stay housed in moisture. this is how it can pass person to person by the air. water molecules from the lungs. a poorly ventilated room could hold the virus longer.
if the environment stays moist, the virus may remain contagious for a longer period of time. this would be how a an environment can become fomite.
taxi cabs being hailed by sick people trying to get to a hospital would be a prime location for such a situation. blood, sweat, and vomit could seep into the seats and be viable for a number of hours, spreading to every passenger that follows.
once it gets into the US, the only course of action will be to shelter in place. barricade yourself inside and wait it out. i would estimate a 4-8 week window would be required for it to burn itself out without the ability to spread.
Dont forget that in several areas where it has burned through already , they are seeing a resurgence of Ebola.
This might be due to fomites , or to the rainey season.
SInce the virus can remain vital for up to 5 days on either hard surfaces , or in water , I am sure that the West African 'rainey season' is assisting to resurgenece.
QUESTION : Has anyone seen thermal effects on the viability/vitality of the virus ?
Does the virus have the ability to go into 'suspended animation' in freezing temperatures , and then re-annimate ?
I ask this because some virus samples had been nitrogen frozen by the CDC .