I'd agree. After L dies the show does drop in quality, but I did enjoy episodes after with Near, Mello, and Light. I think they could have been either introduced earlier as another poster said or not introduced at all. It could have ended with either both L and Light dying, or Light winning in the end. And then if they created another series maybe Light died before the series introduction, and someone else took over in his stead. And that's where you get introduced to Near and Mello.