If we are rethinking credit for authors, perhaps any discussion on the subject can be guided by the experiences of software developers.
Giving authors credit can be seen as analagous to people having their names listed at the top of source code: it gives people a sense of ownership of the code, or the article in our case.
In software, there are three positions that are discussed:
I'll leave you all to work out the analogies and how this applies to author credit - but the links here (and Google) will give you some idea of the various opinions that people in the software business have to this problem. May be useful as a discussion point.