[Mysterious Dark Lord v3.2]

This refers back to whether supers get one set of inheritable powers or it's random.

If powers are themed and inheritable, then clans of superhumans with specific themes to their powers will have begun to form. As these clans become more distinctive and develop their own subcultures, this could be the beginning of speciation.

And it would be ridiculous to assume everyone with powers would become superheroes and villains. A sizable percentage (probably the majority) would adopt normal lifestyles, with their powers being a secondary concern. Of course, many professions would be changed by super-powered practitioners. (Construction and medicine are the top two that spring to mind.)