Probably not. Phones have been great at adding more functionality, and they're really good at serving use cases of people who wouldn't have ever carried around

Probably not. Phones have been great at adding more functionality, and they're really good at serving use cases of people who wouldn't have ever carried around a dedicated device before the phones supported it. But for the kind of people who were serious enough about something to carry around a dedicated device to do it, I've seen that phones have a hard time replacing it outright. Think of pictures, phones are convenient and take good-enough pictures for most people, but they're still not a replacement for anything but the cheapest of digital cameras. Anyone goes somewhere planning to take pictures will bring a dedicated device. For me its music. I tried listened to music with my phone exclusively for a few months, and it hurt, I've gone back to my mp3 player. I wanted to like my phone for music, I really did. As much as I would like it to be true, the economics don't make me think there will be many fields where phones are going to be more than wide-breadth shallow-depth devices, especially when hardware is the limiting factor.