This decision was not taken lightly. The BSA took a long, deep dive into the American Zeitgeist and came up Woke. It's not surprising, that's where the corporations are along with the families with the disposable income AND high community involvement.
And, sure, membership will decline at first. Many folks don't like the changes and are on the way out. It will take some time before Scouting 2.0 makes its way into the public consciousness. As somebody mentioned earlier, some families are reluctant to join because Scouting has a reputation for being "red."
But it won't last. There seems to be a yearning among parents. especially the "blue" ones, for values-based outdoor youth development. IF they can work out the YPT stuff, I think this thing will take off again. The Movement will look different, more urban and coastal, but will ultimately thrive and once again occupy the place of esteem and importance it once held in society