I think that ship has sailed honestly. They had a period where they could have tired to continue capitalizing on the wiimote's success/functionality, with where the wii motion plus was iterating on the concept, improving people's experience. They could have gone places with it if they really nurtured the thing and continued to make the right software for most consumers.
But they abandoned ship early, had really confusing messaging at the end, allowing a proliferation of so many garbage attachments and peripherals that people had to carry friggin' sacks around with them to determine which game they could functionally play at any given moment (/hyperbole). It was supposed to be kept simple, but limitations in the technology when it launched and some bad policy decisions/software decisions/strategic decisions led it off rails.
I think they need something new, and then they need to be confident about it. And if they are going to introduce a concept, they absolutely have to be sure they're ready to showcase why everyone needs it in their life in a way that is easily communicable, easy to understand when watching live demos, and which illustrates how well it works in some system defining software that people can write in reviews how "the game and system were essentially designed in tandem they're so synchronous."