Renowned Comic book writer Christopher Jones had recently given a statement on what would it take to get a season 3 for Young Justice.
On his home page Christopher has written an in depth personal view on the subject of bringing back the show after so many fans have asked him.
http://christopherjonesart.tumblr.com/post/105591350643/people-ask-all-the-time-what-it-would-take-for