Petition away--no problem with that. But am I going to fight to join the "He-man women haters club" or start a club of my own?
(The latter.)
I suppose these gay Scouts and their parents know better what's good for them than I do. If they don't feel welcome in the BSA, they won't join. Some of them obviously prefer to be a member of BSA, than to start their own organization.
And that makes much sense to me. If I were gay and interested in scouting (neither of which is true), I would want to do that with my local friends, regardless their sexual orientation. I wouldn't see the point in joining an all-gay scouting organization - which probably wouldn't even come to exist since a) there aren't too many openly gays in one area anyway, let alone those who are interested in scouting and b) that would have a sexual undertone, when it's really just about scouting.
I also don't believe the BSA was pressured by PC. I believe it's more likely that many boys entered the BSA when they hadn't any sexual preference at all and later realized that they were gay (or "developed into it" for those who think that's more likely, whatever). All of the sudden they would have to be thrown out of the BSA for no real reason and most likely their friends, their friends' parents and their scouting leaders weren't really happy about that, since they liked these kids too. And since being gay is less of a stigma today than it was decades ago, the organization changed its rules to stop this. Good move, imho.
But whether or not anyone of us believes it was a good or a bad decision, they most certainly had the right to decide that way.