The company faces a crossroads as Fox News Channel gets set to mark 20 years on the air this fall. The dominant ratings leader and financial steam engine powering corporate profits not only has to keep that momentum, but a new boss will be presiding over its brew of right-leaning bravado and poke-in-the-eye populism. Who will be stepping into Roger Ailes' shoes is, at the moment, the most pressing question facing the $52-billion conglomerate. Jon Lafayette has more.