There was recently an interesting discussion on this on HN: https://news.ycombinator.com/item?id=20580017

Honestly, while it's all true, with the tools we are using and the endless onslaught of instant notifications, I don't see any meaningful cultural changes possible.

Multitasking doesn't exist. Distractions do. Deciding which is a task and which is a distraction is the only way to get anything done.