What does the year date have to do with such questions? "Is […] worth it in […]?" Either you want a thing and have use for it – or not.
As already mentioned above: The Wii U is an excellent emulation machine and able to play most Nintendo games from NES/GB up to Wii U.
That said, I prefer the Wii¹ as an emulation system because of its fast boot time, better resistance to softbricking (I tend to try out things and play around…) and simplicity – as well as the native controls for GameCube games. So my Wii U serves only one purpose: Playing Wii U games. The library might be small compared to other consoles, but there are still plenty of Nintendo first party titles which I enjoy.
With or without using emulation for older systems (as well as the backwards compatibility with Wii games and the Nintendont hypervisor for GameCube games), I would say the Wii U is worth having.
Good luck and have fun!
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¹Note: The Wii doesn't have digital output by default while the Wii U has HDMI which is a plus on newer TVs that lack analogue inputs.