It will begin with simply leaving the iPhone at home while taking Apple Watch and AirPods on a run. Then it will expand to being able to leave the iPhone at home when running a quick errand. Soon, the iPhone will become the dedicated device for tasks like watching video and writing emails. Eventually, the iPhone will begin to be treated like an iPad or Mac, serving as the device we turn to for those times we need a more powerful device. All the while, more and more tasks are given to Apple Watch and AirPods.
Throughout this process, Apple services such as Siri, iMessage, and Apple Maps will play a big role in making this transition away from iPhone possible as the very nature of computing tasks are simplified. As third-party developers embrace Apple services in new ways, the way we interact with these services will also change.