It seems odd to me to focus on Wikipedia as the comparison point, but then again I was on C2 back-in-the-day and have always seen the quintessential wiki as a superior version of a forum rather than Wikipedia. If we are comparing to currently-active technology, I would argue that the federated wiki concept has the potential to bring tumblr or del.icio.us style contributions to a different, longer-form audience.
I do worry that the federated concept will make authorship too important. The lack of permanent credit on C2 was part of what made it valuable: people more often wrote things to contribute value when they didn't have the motivation of scoring points, gaining karma or making a name for themselves.
I do worry that the federated concept will make authorship too important. The lack of permanent credit on C2 was part of what made it valuable: people more often wrote things to contribute value when they didn't have the motivation of scoring points, gaining karma or making a name for themselves.