In essence the last point has already occurred. PeerJ (https://en.wikipedia.org/wiki/PeerJ) is another open-source journal that is a lower-overhead journal that was created by a former PLOS ONE exec (Peter Binfield). However, it isn't well known and in part for that reason has an impact factor roughly one half that of PLOS ONE. Part of running a successful journal is getting mindshare to get people to submit and to read (and cite) what is published there. And that means advertising, one of the things Kern doesn't like that PLOS does.