RE: Are we there yet? Are we there yet?
Even for someone who was born not that long before the internet revolution it can be hard to adapt to the pace of modern "data processing". It's already been shown that if you try hard to keep pace, you brains will adapt -- those who constantly use the internet store data in their brains differently. And now we'll also have to adapt to the prevalence of AI data processing! Those born into the latest stages of human cybernetification won't have have the issues we have.
I doing a bit of a personal experiment in attention-partitioning and brain adaptability, by forcing myself to take breaks or switch activities based on a timer. I've not narrowed down my own optimal timing window and the information that is already out there is frankly not much help, but switching focus in under an hour does help keep the brain refreshed and at peak performance (from my own observations so far). It's terribly annoying though, interrupting a focused activity base on your phone's alarm clock!
I think that study might be a little chick or the egg.
I think that it could be even a little more random than this so it doesn't become too habitualised as good habits today can become tight constraints tomorrow. Although the brain will evolve, the speed of evolution is unlikely to keep pace with the flow of information. Factor in that most information is irrelevant and it is going to cause a range of other problems. As I see it, there are certain core functions that are degrading such as the ability to laterally think and be creative.