Let's be honest, this change has nothing to do with allowing young girls their chance to embrace scouting. It has to do with poor attendance. BSA running with this angle isn't going to change the heart of the problem. Little boys aren't joining or staying in the scouts. I can tell you from my personal experience the troop I joined sucked. The only time we went camping was a single trip that was once a year. I joined the Civil Air Patrol a few years later and found that to be substantially more enjoyable and worthwhile experience than the scouts ever could have been.
I never said why they changed policies, just that I'm okay with it. I understand a big factor in the choice was likely due to falling membership numbers.