Honestly, I think this really boils down to the evolution of Boy Scouting into a family-based activity.  I married an Eagle Scout who went on to become an Assistant Scoutmaster long before we had children of our own. I soon joined in the fun as a Scouter, and when we became parents, our children of both genders wanted in on the action. It was painful for our daughter to be excluded, and the wait for Venture Scouting, which became available to her at age 13, felt like an eternity. We wanted very much to experience Scouting as a family, not as separate genders, and that appears to be true of many of our generational peers. Both organizations would be wise to think long and hard about how they can remain relevant, and if that means looking beyond single-gender programs, so be it. Our family would cheer the progress!