Here's the thing, making Scouting coed wasn't something I was a big fan of. But, if I had a daughter, I'd rather her be in Scouting BSA than the Girl Scouts. Better at teaching important life skills. I know, because I've seen First Aid taught in both programs. BSA classes were longer, and more in-depth, with skill testing at the end. The GSA class was over in two hours, with badges handed to everyone.
As for the whole boy/girl things, it's really no different than marching bands, youth groups, or other coed activities. You do due diligence to prevent the sex, keep them supervised, and teach the program. Yes, it will change, because boys will act differently with girls around, but the lessons are still the same, and still worth teaching.
I
have three girls. And I'd much rather them learn the lessons from the Boy Scouts than the Girl Scouts, because Girl Scouts are insane.
You know what I did? I found a
different program designed for girls that teaches them better lessons than the girl scouts.
That throw-away statement in your quote that I bolded is HUGE. It's not a, yeah, things are just different now. The point of Boy Scouts (and, similarly, the original girl scouts) was to free boys and girls from the pressures of the opposite sex and learn, grow, and develop for at least a short time.
I can recall being 14 years old. And, like any other 14 year old, I was a red-blooded male interested sex.
I can recall an entire 2 weeks where any concern about sex was pretty much absent (imaginations still existed.) Hiking with my troop through the mountains of New Mexico, exhausted many days, learning and experiencing and growing outside of those concerns. I did not appreciate what it meant, in fact I didn't even realize what had happened at the time, but looking back I can see how useful an experience that was.
I have no idea if Trail Life will grow to become as useful as Boy Scouts, but, for my boy's sake, I pray it does, as "Scouting" doesn't seem to understand the mission any longer.