Tom Llamas set to take over NBC Nightly News, following Brokaw, Williams, and Holt. With ABC News in turmoil and CBS scrambling post-O’Donnell, the network news shake-up is real. #TomLlamas #NBCNightlyNews #LesterHolt #MediaShakeUp #BroadcastNews #Journalism #ABCNews #CBSNews #NewsroomDrama