Get the entire league to agree to this first, and then have his team be "auto managed" based purely on these rules:
1. Use a predetermined weekly Player Ranking column on the internet to decide who starts.* That way there is no arguing about who should start each week on the abandoned team.
2. NO trades allowed with this team
3. The team is not eligible for the playoffs
* - For example, you could use Ronsenthel's each week:http://www.rotoworld.com/content/features/column.aspx?sport=NFL&columnid=57
Then, go find the quitter and beat the snot out of him.