Talk about a target-rich environment.
It’s already a settled issue, per the Supreme Court.
I’d expect that most lawsuits along those lines would be dismissed. Those that aren’t would be covered by legal insurance provided through the national organization, or the sponsoring one.
I would expect the Mormon and Roman Catholic sponsored BSA councils etc to fight tooth and nail. Both have VERY deep pockets.
. . . and those individual Councils would likely leave it up to individual chartered organizations.
It's been done before. People forget that the Cradle of Liberty Council (Philadelphia) voted in May 2003 to end discrimination based on sexual orientation.
In 2003, however, the BSA sent the Cradle of Liberty Council a cease and desist letter, the Cradle of Liberty Council rescinded its nondiscrimination policy, and the COL Council went on to battle the city over rights to its building.
Do NOT defend!