Those are just the politicos. Your forget people like David Patreaus or John Bolton. I'd pay good money to see a debate of Obama vs Bolton.
As to Obama, we need to look back to LBJ. When Eugene McCarthy came within 6-7 points of beating him in the '68 New Hampshire primary, LBJ understood his position and folded. Hillary has kept her nose clean in the state dept and after she resigns in the next year or so, she will make a run against him. For the Democrats, dropping a president whose ratings suck and has shown that he cannot do what he promised will make it easy to nominate Hillary.
Hillary will wait until 2016. She can pick up where Obama left off.