I don't see it as ever being one single pilot alone even though it's do-able. I do see the FO being a self contained robot. The hardest part of robotics is mobility, since it will be permanently seated that's not an issue. The rest has already been done, it just needs to evolve to the specific task. Because data is sharable from the Captains perspective it'll be like flying with the same robot every time.
10 years away I think and we'll start to see that as a happening thing.