Yes, I agree.
Close to where I live, flowers were left at the scene of a fatal accident which must have happened the best part of a year ago. The remains of the flowers and wrappings are still there and to me it seems that the victim has been totally forgotten.
Talking of Diana's funeral, another practice which I think started then, is that of clapping as the coffin passes by. It became the norm at Wootton Bassett.
I'm perhaps old fashioned and perhaps won't be popular by saying it, but I feel that at such solemn events silence is more fitting.