If the disease cannot be gotten under control in the African countries experiencing outbreaks, then all bets are off and eventually it will spread. This is not up for dispute.
Treating it in those countries is hard because they are having trouble attracting enough people to help- not just medical staff but those who can handle logistics and planning schedules for the workers, who must do shifts. There is an enormous amount of work to be done treating each patient, disinfecting premises, disposing of bodies, etc.
A lot of training has to accounted for as well, and all these things take time and money.
If everyone in contact with the ill had to undergo full quarantines there will soon be no one to help, people simply can't afford to not have income for that long, and as much as it's nice to to say this will have to be taken care of, the money is not there, and people aren't donating a lot either. The seemingly large amounts pledged by countries is really a pittance compared to what we spend on the military every day, there just isn't enough.
There have been some really interesting discussions here recently but many of them simply don't take into account the political, economic, and most importantly practical aspects of dealing with this situation. We have come to be so mistrustful and critical of governments, of various authorities, and of, well, everything, that we have in a large way lost a fundamental trip on reality. From the panic to the political point scoring, the wildly impractical 'solutions' it's a fascinating saga to watch unfold. We have also come to believe that everything has an easy answer and that by 'just doing' one thing or another than the problem will go away. It's two directly opposing ideas that we seem to be able to entertain as a population at the same time, it's just the way we seem to be made.
Personally I'm amazed at how quickly most countries have adapted and made intelligent efforts at containment, dealing with patients, responsible communications, and just generally dealing with a situation that is as challenging as any faced by mankind before.
I just wish here was a bit more humility, a lot less armchair quarterbacking, and NO political high jacking of an issue that requires international, bipartisan, and selfless cooperation. It's the only way to deal with it, and in spite of how easy it is to find screwed up things about how humans act, in the main I'm amazed at how resilient and responsible humans can be, not to speak of the ingenuity and intelligence, and the selflessness of many people.
In many ways the speed at which information travels is a curse and a blessing. We can educate ourselves quicker than ever and overcome the most difficult situations, hopefully we can also contain the suspicion and fear that results from ignorance, lies, manipulation, and that have no doubt accompanied epidemics since the dawn of modern man.
I'm no more worried than I ever was, but as before I don't expect this to go away in an instant either.