Always wishing there would be some discussion on the full title of Darwin’s book, “The Origin of Species and The Preservation of Favoured Races.” If that were an open topic, liberal evolutionists would be forced to deal with their hypocrisy and the textbooks re-written. Unfortunately it’s not going to happen.
You speak as if the theory of evolution has not itself changed since Darwin. That is, of course, false. Why would someone want to debate something that is, a best, an interesting history and beginning point. Darwin had an woefully incomplete understanding of geology and an incomplete knowledge of biology. He didn’t have DNA, radiometric dating or plate tectonics to work with. Survival of the fittest isn’t survival of the best.
FYI, the majority of life scientists have never read Darwin's book and have maybe heard the title of it. When I was in college, our discussion of Darwin was limited to discussing the voyage he made to the Galapagos Islands and the crucial observations he made there which led to his formulating the first working theory of evolution, the one that developed into the working theory we use today. It has been considerably refined since Darwin's time, but is still completely crucial to the study of biology.
The title of Darwin's book really has very little relevance to our use of the theory.