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They are already selling $999 phones, it's hard to see how he can squeeze any more money out of the iPhone.Several ways. They're actively looking into health sensor integration, with third party (and their own) devices, medical records, and with the Apple Watch as a continuous sensor. That's a huge market, even more lucrative than smartphones.
Second, they're better poised than anybody in this IoT thing, with their home automation platform.
Third, they are entering the living room, starting with the speakers, tv, etc. When they get serious with this (especially since they also combine it with their home automation) they'll have another nice market to tap.
Fourth, they've long since licensed Car Play, and they also have their own autonomous car project under continuous development. Whether in partnership with a car company or on their own, they can do quite well with e.g. their own electric city car.
Fifth, they also work heavily (and have made acquisitions etc) in AR / VR technology. If they put out some device, it wont be a prototype for enthusiasts like the one's we've seen, it will sell like crazy.