From Media Decoder on NYTimes:
Like a lot of us, I grew up watching Johnny Carson every night and the chance to one day sit in that chair has meant everything to me…. It was my mistaken belief that, like my predecessor, I would have the benefit of some time and, just as important, some degree of ratings support from the prime-time schedule. … After only seven months, with my Tonight Show in its infancy, NBC has decided to react to their terrible difficulties in prime-time by making a change in their long-established late night schedule. … For 60 years the Tonight Show has aired immediately following the late local news. I sincerely believe that delaying the Tonight Show into the next day to accommodate another comedy program will seriously damage what I consider to be the greatest franchise in the history of broadcasting.