I think the essence of BDSM is "un-PC".

There used to be a smaller community, and the people were hardcore. As Femdom became popularized more types of people got into it and the restrictions you mentioned came into being.

My intuition is that smaller core of harder core players who want wild things are still there. The videos they want to watch and the activities they want to do will just be in small hidden corners.............just like it was before.