The theory is one thing, but reality is another. In order for that virus to live that long, it has to be in an ideal condition. Nearly freezing, and on just the right surface.
But even if it's alive, is it strong enough to infect anything or anyone? Or will any contact with something living kill it? Those are the real issues. From what we have seen in the cases in the US, the virus has to be super-strong, raging, with fluids everyone, to infect a human.
Maybe the theory is just a scientific version of fear-mongering? All of these one-off studies serve to muddy the waters, but fear-mongering attracts donations, and the attitude of researchers is that no crisis should go to waste. This ebola "crisis" (with two people getting infected in the US, in the history of ever, and yet fear and hysteria everywhere) is no different. So there's that.