I think there was a sense that the impact was being lost because the audience was so familiar with the form. You combine that with people's attention spans, which are clearly conditioned to be shorter now, and there's a need to vary the paradigm.
“I don't for the life of me understand how anybody could contemplate the results of the 2000 election in the US and say that electoral politics doesn't matter any more, and that Ralph Nader was right when he said there is no difference between the two parties.”