Ebola is not spread that way. It’s infectious, not contagious. You need direct contact with bodily fluids of an infected person.
Ebola virus particles degrade when exposed to light in less than a minute. Transmission has to be direct - blood to blood, saliva to saliva, vomit to blood or cut.
You can’t get it from an elevator button.
Although most of your facts are correct based on study of traditional Ebola filoviris, I think you are overly complacent on the transmissibility. Obviously, wet oral secretion on a doorknob or elevator button would be infectious for some limited amount of time. Some of the infections of suited medical personnel are difficult to explain. Either there were gross safety protocol errors or the transmissibility of this strain is greater than thought. In addition, mutations could change the ballgame at any time.
It also appears to be spread by mosquitos:
http://www.cidrap.umn.edu/infectious-disease-topics/vhf
“Pathogenesis
The pathogenesis of hemorrhagic fever viruses is not completely understood; however, key points include the following (Peters 2002):
Hemorrhagic fever viruses enter the bloodstream through various mechanisms (eg, the bite of a mosquito or tick, inhalation, mucous membrane exposure, parenteral exposure), and all (except hantaviruses) cause disease during the period of viremia.
The infectious dose for hemorrhagic fever viruses appears to be low (1 to 10 organisms) (Franz 1997).”
Which would explain the huge uptick in infection rate after the beginning of rainy season in West Africa on the graph a bit down this page:
http://en.wikipedia.org/wiki/2014_West_Africa_Ebola_outbreak
Then it spreads pretty much like HIV.