Are you sure about skill floor? I've only ever heard it used to describe the skill required to get into something, and skill ceiling describes the highest level of mastery. I've never heard your interpretation, and it doesn't make sense to me.
I've also never heard that use of "skill floor" before. The "floor/ceiling" descriptors imply min/max constraints.
I've also never heard that use of "skill floor" before. The "floor/ceiling" descriptors imply min/max constraints.