Interesting take by Hamish McKenzie on Pandodaily. In his opinion, the reason Media Publishers feel bold enough to attack Google and feel entitled to have a revenue share is that Google News is a declining service.
He lists Mobile Agregation but also Human Curation as two trends that make its algorithmic filtering less relevant.
So interestingly, while many have attributed to Google's own algorithm changes the demise of services like Wikio, it seems that now Google's own algorithmic approach is challenged by social curation.
Via Giuseppe Mauriello, Guillaume Decugis