This is a very good question, Peter.
Of course I have no answer, but what I can say is that the project for a European Federation for Science Journalism was launched after many failed attempts to convince everyone in EUSJA that a much faster pace of reform/change was needed to keep relevant journalism associations – such as the French Association des journalistes scientifiques de la presse d’information, AJSPI, that had left EUSJA in recent years – in the loop.
In the last general assembly (held in Vienna) there were several unsuccesful attempts at mediation, among others by Joost van Kasteren (from the Dutch Association), Rosemarie Waldner (President emeritus of EUSJA, from Switzerland) and Connie StLouis (from ABSW), but the majority of EUSJA delegates and the re-elected board decided that they prefered to leave those dissatisfied associations out (as a result, ABSW left EUSJAhttp://www.absw.org.uk/news-and-events/absw-news/absw-leaves-eusja.html, and other important European associations are considering to leave EUSJA).
By the way, the Norwegian association of science journalists that had just become e member of EUSJA in Vienna is also working with EFSJ, because we are more than willing to accept associations and individual members who want to work to promote high quality science journalism.
UPDATE: In the final weeks of 2014 two more historical European associations of science journalists officially left EUSJA like the British association ABSW, bringing the total to 3: both the Swiss association of Science Journalists – SASJ, who was among te founders of EUSJA in 1971 (http://www.science-journalism.ch) – and the Dutch association of Science Journalsts VWN (http://www.wetenschapsjournalisten.nl/vwn/) officially announced their formal decision to leave EUSJA.
(Of course the EUSJA website, that still lists those associations, needs to be updated).