...in the same way that people used to just accept bulky laptops with terrible batteries, I think people today have become inured to just how annoying it is to get your phone in and out of your pocket. This is why phones get dropped at broken constantly. Phones suck, and I don't think they are the final form factor.

The final final form factor is probably a pair of glasses (or an implant), but I still think that's pretty far away. Before that can happen, we need computer chips and batteries to become almost microscopically small.

For the foreseeable future—still long term, but much closer than glasses—I think the logical form factor is a smartwatch. For photos, it would have an under-screen front-facing camera, and an outward facing camera on the wrist band. The screen would be a bit larger than today's largest Apple watches, and it would fold out like a folding phone when you need more space.

Even unfolded, the screen would have to be smaller than what we're currently used to on smartphones. However, this would be less important if most interaction was done via AI, just as limited-interaction iPods and Blackberries never commanded massive screens. People who want to watch movies, read longer books, or play games on larger screens could still carry folding tablets in their pockets on some occasions, but the watch would be the central device everyone always has.

Apple, of course, already makes smartwatches, arguably the best ones on the market. But an Apple Watch is very much not the device I'm describing, and I'm not sure if Apple will let it get there. Apple is stuck in the innovator's dilemma, where the iPhone prints so much money they can't afford to cannibalize it. For the moment, the iPhone has been so good that this hasn't caught up to them. I think—and for the sake of innovation, I hope—that this doesn't last forever.