I really do hope this does happen one day.  Abag recommendations are just recommendations and cities and towns have their own prerogatives.  If they all merged it could be so much better.  Integrated transportation, integrated development plans, integrated politics, etc.  Goodbye SF supes with their insular pet projects.  Hello integrated urbanism and development, if it ever were to happen, this area could be just so much better.  No Bart stopping at the San Mateo border, as initially happened.