I am of the belief that one does not need playing experience in order to be a successful coach/leader.
Love for, and knowledge of, the game is what's necessary - as well as being able to effectively communicate with the players.
I think women likely enter an NFL coaching opportunity behind the 8-ball, due to some players' pre-existing beliefs and/or skepticism.
It will probably take one female coach of a very successful unit, and (of course) TIME, for them to be more naturally/immediately accepted.
Like any line of work, my hope is for teams to simply hire the best person for the job. I love seeing this barrier being broken.