Well, as I noticed, in an interesting coincidence, Hera is born (prematurely) right after Razor. The first hybrid was a combination human and Cylon, Hera is a much later approach to the same thing. It makes it possible that the first Hybrid downloaded into Hera as a continuation of his line, and thus Hera would be the final Cylon. You don't see people nominating her, though. The big problem is how to make her old enough to play this role without some hokey accelerated growth. You would have to have a multi-year gap in the story. A one year gap was shocking enough to the audience on New Caprica. Could they wander in the desert for 10 years, without resolving the questions of the 4 Cylons. Probably not.