I’m surprised that anyone ventures so far into this thicket of sophistry. I get stuck much earlier in the equation. Everyone has an attention span: really? And really again: an attention span is a freestanding entity like a boxer’s reach, existing independently of any newspaper or chess game that might engage or repel it, and which might be measured by the psychologist’s equivalent of a tailor’s tape?
If material is engaging people will focus on it, regardless of what their supposed attention-spans are.