As to who would be part of an elite, well...under the scenario I have laid out, at first it would be anyone who didn't have a serious genetic disorder. However as "elite" implies a minority, I do not consider conventional eugenics, which would only target a small percentage of the population, to be a vehicle towards elitism. However, as over time technology will make precise manipulation of the genome a reality, an elite group will coalesce. The financially wealthy will make up this group - like today, we will be able to access better quality treatment, and a wider range of it, than the majority. As much as I will be condemned for saying it, I do truly believe that this is the way it should be, because if everybody had equal resources there would be no motivation to work hard. Some inequality and diversity is desirable in a society. This is why I think eugenics should be regulated, and I laid out how in my earlier posts.
Arguments about genetic diversity are overly hypothetical. For a start, I would point adherents back to my meteorite analogy. Also, they fall on their face when you consider that many people with serious genetic disorders are going to be a biological dead end, either due to other people practicing a primal form of eugenics on them or the invalids themselves dying or being incapable of putting themselves out there. I also mentioned that medical advances mean that we don't rely on genetic diversity in the way we once did.
Sorry to say, but there is a serious lack of Te in this thread.