All shows need a strong lead in. People walking away from the tv and forgetting to turn the channel(or falling asleep) are viewers.
I'm not sure why anybody would be insulting Leno. First he was fired from the Tonight Show (or use any word you think is more fitting) then his Prime time show is cancelled. He is then offered only a 30 minute show.
Conan, with bad ratings got to keep the most famous show on late night tv with only a minor movement in the timeslot.
Can you imagine a prime time actor bitching that his show was move by 30 minutes?