Don't know if the speed of information transfer causes the decrease in attention span, just no ability to stick around and finish the sentence, thought or essay. If you text, you shorten everything with little stuff, light stuff, not really serious stuff and it is gone not to be remembered by posterity.
Does seem to be a bigger problem than I have words and space to analyze and convince you since you are already tired reading along to see if I am going anywhere with this. Think I will sneak off to read a book. Remember reading all night? Spent a lot of college time reading everything except my course books, which were dull.
Testing is multiple choice, was that an indication that we don't develop minds to think in large concepts and block and blocks of logical reason?