I'm serious: about 80% of my day is meeting with real people in the real world. Mobile phones haven't changed that.
The other 20% of my day is sitting at my desk creating original work product (mathematical models and thoughtful memoranda) or reviewing the work product of others. Mobile phones haven't changed that, either.
No doubt the drought in PC sales is real and permanent. But I wonder how much of that is because people just don't need to keep their laptops up to date in the age of great cloud services.