Hopefully the docking station will enhance the technical capabilities of the standalone portable console,so that when used as a home console it will be powerful enough to manage PS4 and XONE ports.
Just wishful thinking, I know...
A lot of games are built on scaleable engines so most devices can run those games.
The Xbox360 manages to run Rise of the Tomb Raider and a according to a TechGAF thread it only has 94Gflps of usable power (.094Tflps) the issue becomes more about acceptable resolutions/frame rates and other effects.
Would most Gamers accept Overwatch if it looked like a N64 game with every setting turned off and rendered at 360p? Probably not. But they do accept 720/60 on the Xbox one regularly. And even 720/30 on the Wii U.
I think this is the question Nintendo is trying to answer with the NX. What's the baseline performance most consumers will accept is it 540/60 with a solid AA solution and upscaling.