I am not too worried about ebola, just yet (but I not in Dallas either). Sure it is a horrible disease but so far the amount of people that died in Africa is about the same number that dies in the US from flu every year. On top of that the conditions that those people live in Africa are absolute squaller so the death and transmission rates won't necessarily transfer over to the Western World.
What does worry me is that this disease is already been politicized. When the government doesn't want to put travel restrictions on west Africa because they don't want to be seen as racist then there is a big problem. This should be easy to contain but they'll never let a good crises go to waste.
Not to nitpick your post, but . . .

It's not the number of people who die, it is the mortality rate, which for ebola is ca. 70% of the cases die. With flu, the mortality rate is in the single digits IIRC.
As for it being politicized, well, yeah, that's the point. Look at how this government handled the original cases. They ignored the cases in Africa, then, without fanfare, announced they were bringing the 2 missionaries with ebola into the US, completely bypassing the question of "should we". They just did it. And since both recovered, they can now say "See, no big deal, we can handle this." Only they can't.
It reminds me of the scene in V for Vendetta where John Hurt as the Big Brother figure announces angrily that "We need to remind people why they need us". Think this is happening right before the election by coincidence? Think that the US government owning a patent on an ebola strain is a coincidence? Or the fact that the US .gov owns the only trial cure?
As to the OP - anywhere in the western hemisphere is too close for comfort. It is not a disease anyone here is prepared to handle - witness CDC and the Dallas hospital. Nor is there any real biological resistance to the disease, no natural immunities, which means the mortality rate here could be much higher than 70%. Especially since we don't have a clue as to why the 30% of the victims in Africa survive.
Remember how we were taught in school how evil and vile the North American settlers were in the 17th through 19th Centuries were for giving smallpox-infected blankets to the Indians? Bringing ebola into this country intentionally is the same thing IMHO.