Regardless of the time frame that the experts tell us it will take to develop a vaccine, this process is going to need to be accelerated so that it becomes available in at least an "advanced testing phase" by, say, October or November.
I wouldn't be surprised if China has something even sooner, but of course their precautions insofar as ensuring safety go may be (cough) "less than ours".
But if they get something out by summer, and it appears to work, we'd be foolish not to take a good look at it.