This is an interesting question, and I can confidently say the technology exists to have some quantity of human vaccine within 3 months. Will it be enough to have an impact? Probably not. We're talking about needing millions of doses. But if the companies in the space can succeed at at least showing the turn-around-time for some quantity of working vaccine is possible, then it becomes an engineering problem and not a scientific problem. Then you just need to marshal resources and you could be at a place where bulk vaccine could be produced in that short window of time. This 2019-nCoV marks an inflection point for humanity IMHO where sequencing costs, data transmissions, and vaccine technology are all good enough to actually accomplish a real-time vaccine. The science is here, now it's just turning a bigger crank.