How to disable Bluetooth Sharing via terminal?
This is what I'm using for Yosemite:

First, grab $hardwareUUID:

hardwareUUID=$(/usr/sbin/system_profiler SPHardwareDataType | grep "Hardware UUID" | awk -F ": " '{print $2}')


Then loop through existing users and set to "Disabled"

for USER_HOME in /Users/*
  do
    USER_UID=`basename "${USER_HOME}"`
    if [ ! "${USER_UID}" = "Shared" ] 
     then 
      if [ ! -d "${USER_HOME}"/Library/Preferences ]
       then
        mkdir -p "${USER_HOME}"/Library/Preferences
        chown "${USER_UID}" "${USER_HOME}"/Library
        chown "${USER_UID}" "${USER_HOME}"/Library/Preferences
      fi
      if [ ! -d "${USER_HOME}"/Library/Preferences/ByHost ]
       then
        mkdir -p "${USER_HOME}"/Library/Preferences/ByHost
        chown "${USER_UID}" "${USER_HOME}"/Library
        chown "${USER_UID}" "${USER_HOME}"/Library/Preferences
        chown "${USER_UID}" "${USER_HOME}"/Library/Preferences/ByHost
      fi
      if [ -d "${USER_HOME}"/Library/Preferences/ByHost ]
       then
        /usr/libexec/PlistBuddy -c "Delete :PrefKeyServicesEnabled"  "$USER_HOME"/Library/Preferences/ByHost/com.apple.Bluetooth.$hardwareUUID.plist
        /usr/libexec/PlistBuddy -c "Add :PrefKeyServicesEnabled bool false"  "$USER_HOME"/Library/Preferences/ByHost/com.apple.Bluetooth.$hardwareUUID.plist
        chown "${USER_UID}" "${USER_HOME}"/Library/Preferences/ByHost/com.apple.Bluetooth.$hardwareUUID.plist
      fi
    fi
  done


If you just want the chunk that actually disables the value, see below:

/usr/libexec/PlistBuddy -c "Delete :PrefKeyServicesEnabled"  "$USER_HOME"/Library/Preferences/ByHost/com.apple.Bluetooth.$hardwareUUID.plist
/usr/libexec/PlistBuddy -c "Add :PrefKeyServicesEnabled bool false"  "$USER_HOME"/Library/Preferences/ByHost/com.apple.Bluetooth.$hardwareUUID.plist
chown "${USER_UID}" "${USER_HOME}"/Library/Preferences/ByHost/com.apple.Bluetooth.$hardwareUUID.plist