Will AIs make most of the scientific discoveries in 50 years? Given the advantage AI already has over human intelligence, one could imagine a relatively weak strong-AI (barely human intelligence) still outperforming a segment of the human scientist population in terms of scientific discoveries per year (or hour).

Will AIs be doing most of the science in 50 years?
According to Ray Kurzweil, a prominent AI researcher, yes. In his book The Singularity is Near he predicts that AIs will take over developing other AIs in about 30 years, after which human intelligence will become marginalised.