I read two of the articles listed.
Learning 2.0, to me, is just a new way of organizing information. Librarians can either use it or they can choose to ignore it.
For example......Research Guides can be created in many older, more traditional formats such as paper and the web. Now, Research Guides can have an RSS feed, or there can be a Research Guide wiki created by students from a class.
If it makes sense to use a Web 2.0 technology to distribute information, then by all means, use it. But don't try to fit something into a technology it's not meant to fit into to