Share 'Disengagement - Higher priority than engagement?'

Getting full engagement is clearly a worthwhile goal. Using a standard bell shaped curve of the organisation ( and in line with normal distribution in an organisation) I suggest that 20% of employees will be somewhat engaged, 20% will be somewhat disengaged and the 60% in the middle will be neither. I wonder would it be worth while to focus on the disengaged first before attempting any engagem...