Here are some other suggestions: 
 *Remove all administrative tools from all admins for 6 months and observe what happens.  
 *Block all users who have been on Wikipedia for more than 6 months and have more than 1000 edits. If any of them attempt to come back as sock puppets block them on sight. Observe what happens.  
 *Change the rules on NPOV so that POV articles only are acceptable. Observe what happens.  
 *Unblock all blocked users, and block all current users. Observe what happens.  
 *Remove the tools from all admins, and give them to all currently blocked users. Invite the blocked users back to get revenge etc. Observe what happens. 

 I think these all would be interesting sociological experiments. I am not sure that Wikipedia would survive, but it would be very interesting.