I like the theory that the reason attention span has declined is because the demand for quality has hugely increased.

Since there are so many blogs, films, books and videos out there, we no longer want to waste time on things that don't entertain or provide value to us.

If in the past you might've given in and read or watched through boring parts because there was less options available, now people demand less B.S. and instant value. Because if you don't provide that, there's someone else a click away who will.