[karam]

I agree with everything you said with one exception. It will be possible at some point to be the head of multiple science fields because our method of learning and storing information is changing completely.

We're making this fundamental shift from storing as much as we can in our heads to storing information outside our heads and learning more efficient ways of looking things up.

As the depth and breadth of our collective knowledge base increases so will our capacity to access, make connections and implement that knowledge.