If I remember correctly Nintendo once filed a patent for a Dock that included its own hardware that can supplement the handheld part of the Switch. So, if you'd dock it, it would get more graphical power for instance. I hope that still comes to fruition. Would be cool.
In fact I hope they'd take that a step further, and have the next console be completely modular. You could buy and use both parts separately, so people could buy either a 'tv-Switch 2' or a 'mobile-Switch 2' and they'd work individually, but you could also combine those if you have both ('dock' the mobile one into the tv one) and they'd then add to each other's power for better graphics, frame-rates and whatnot. Obviously you'd also be able to buy a 'complete-Switch 2', that included both parts.