> they have to be kept sterile after they come out, which is probably harder to do especially in underdeveloped, resource-poor areas

It's actually very easy. Sterilization takes place in a stainless steel container that has "windows" on it's sides. When the sterilization cycle ends, these "windows" are closed just as the container is taken out of the autoclave. The container will remain sterile inside until opened.

Also, simply opening the container to take one syringe from it doesn't make it dangerously contaminated. As demonstrated by the article, the biggest danger comes from other people's blood (HIV, HCV, HBV), not ordinary bacteria we have on our skin.