PBS Facing CrisisInfighting, Low Ratings, Lack of Hits Put Added Pressure on Public TV By John MotavalliSpecial to TelevisionWeek It once was the only place to go for high-quality television programming. There are still many good shows on the Public Broadcasting System, but viewers now have numerous other choices, especially those who have cable TV, and PBS has experienced years of slow but steady audience erosion. Now, after a decade of failed efforts to reverse the tide and rescue the system, PBS is in crisis mode. America's public television service is beset from within and without, facing defections from...