I am not sure that the internet or technology necessarily makes us more easily distracted. I can remember finding all sorts of pointless things to do whenever I had an essay to write at university. Maybe it makes the distractions feel more useful but nonetheless distracting?
I am also not sure about any coming Dark Age but I do believe that people have to take more responsibility for where they put their attention and their efforts.So much more is possible and so much more takes up our attention. Making the most of that scarce resource is going to matter more and more.