I've been saying for a while that I think the "next thing" is high-powered cellphones acting as a computing device (providing storage, connectivity, and processing power), with several different types of devices acting as dumb terminals.
If you're at home or at work, your keyboard and monitor auto-connect to your cellphone to provide a full-sized screen. If you're on the go, you use your cellphone as-is, or you use an eyepiece or tablet as an alternate display. Ideally, the main apps you use would provide appropriate user interfaces for each situation.
I think you're basically correct, but the docking devices are likely to be more than dumb terminals in some cases. At work that cellphone may plug into another device which provides additional, higher-speed processor cores.
If you're at home or at work, your keyboard and monitor auto-connect to your cellphone to provide a full-sized screen. If you're on the go, you use your cellphone as-is, or you use an eyepiece or tablet as an alternate display. Ideally, the main apps you use would provide appropriate user interfaces for each situation.