I'd be surprised if there wasn't a dedicated portable down the line. Fixed joypads, smaller screen and more pocket friendly. Might require a higher density fabrication process but I think it will happen assuming the Switch isn't a huge flop. Japan especially would appreciate such a model and no doubt will be available in many colours and special editions. You have a single software library but there is no reason to restrict the hardware to a single device.
Down the line we may get TV's with built in switch compatibility.
We aren't talking state of the art here with huge cooling issues we are talking about a chipset which is immensively flexible in how it can be configured.
We could see a Nintendo LED projector with switch compatibility that you can use in any room or a dedicated VR helmet or visor.
