Via a commenter at the Pearson/Lumen panel: Buying processes are getting more complex, and this tends to make authorship less central. Committees are not based on a faculty’s relation to a specific author or expert.
New models may be based on impact rather than “proxies for effectiveness” — author’s name, or the institution, broad adoption, etc. These proxies are being shown to be insufficient indicators.
Of course, The Author is a Lie anyway.