According to a report I read by a man who’s been a Scout Master for years, they did it because of corporate pressure. According to this guy, Scout Masters and Administrators get a retirement pension as reward for their service if they serve a certain number of years. The Corps were threatening to pull the funding.
So, as ever, its all about the money, if this report is indeed true. At the end of this exercize, I expect the Scouts will be Federalized into some sort of Brown Shirt Youth movement.
Your second sentence does not square with my experience and knowledge. Scoutmasters are strictly unpaid volunteers, usually parents of a Scout in the troop or members of the chartering organization, like a church. The professional, paid scouters work through the local council with assignments to districts, camps, or council staff/admin. These people likely do have a retirement program that would be threatened if corporate dollars were withdrawn as a form of pressure on policy.