Souls? Huh, that's also a big problem for me. The argumentation based on the fact that people have other purpose of life than to procreate isn't correct. This is because people have taken care of basic life issues like eating, procreating and surviving in the wilderness by dominating the Earth after having developed a brain that allows advanced processes. Thus, as those things are no longer a problems our minds can seek new challegnes in abstract ways of thinking such as arts, science or religion. Why are we the only such intelligent species? I believe that there's been many books written on this subject by proper specialists. One possible explanation that comes to my mind is that human occupies the ecological niche of 'the smart guy' in the world's ecosystem. Another thing is that for example dolphins are considered highly intelligent, having such humane abilities as self-awareness, complex play, communication and even creative thinking and having sex for pleasure, lol. Why wouldn't they have souls?
As for the christian view on the subject of souls, we all know the God's plan of salvation of the human kind. But what if what Jesus and the prophets before him said about souls is not meant to be understood literaly, the same way as it occured in case of the biblical description of the creation of the world? The change in the interpretation of this piece has been caused by scientific research in physics, astronomy, etc. Why wouldn't that happen in the future in case of other information of which the Bible is the only source now?