I think it comes down to tools and toys. If there is a choice of using a laptop or a smart phone to do something most would choose the laptop. It's a more efficient way of getting something done.
The progress of smartphones is mainly because people get a free phone every time they upgrade their contract. If the phone wasn't subsidised by the carrier would we be anywhere near this figure?
Think about this. Your isp gives you a brand new pc every year you stay with them. Laptop and pc sales go through the roof.