What stops people from getting together, agreeing that a private equity firm would be a poor steward of the .org TLD, choosing somebody else to operate it instead, and pointing the NS records there instead?
Nobody really owns the DNS. It's a thing that works because there is a broad consensus on how it should work. If the consensus is that this is a dumb idea then what's stopping people from choosing not to go along with it?
And staging a coup over this would set a good precedent that these types of flagrant money grabs are not to be tolerated.