SNascimento wrote...
Updated my topic with some ideas that I said I would post here.
Having just read your additions, I find it unlikely I would work well with you

.
I do not subscribe to the theory that a single species must rule, or that it is even advantageous that one do so. Diversity allows for more points of view and ways of thinking, which leads to better problem-solving capabilities and less stagnation (among other benefits, tangible and intangible). My Shepards are not speciesists.
The argument that the Protheans must have done some extermination to become the single species dominating the galaxy during their time is neither based in any evidence (of which I am aware), nor is it a good case for thinking single species domination is a Good Thing. Perhaps it was their very lack of differing species' points of view that prevented them from stopping the Reapers rather than merely screwing up their next shot sufficiently that we have the opportunity to end them. One species = blind spots that aren't countered by others.
As for humanity being the "logical" choice for dominance, I am sure if you were an asari you'd think differently... All species have their strengths and their weaknesses. Ideally, our short-sighted tendencies could be tempered by the asari's longer view, our curiosity educated by the salarian's scientific methods, our arrogance mitigated by the turian's honor, and so forth. Working together we are stronger than the sum of our parts.