It means that it failed at being a video game console. Which it did. It was an awesome money making device and gimmick. The gimmick didn't have staying power. Please don't act like this isn't true.
Sure, the dominant software was a gimmick, but those few games where a little waggle, and the pointer were well used really sold me on the potential of the control scheme. Playing games with your arms naturally by your sides

Resident Evil 4 Wii

Still haven't tried the Vive controllers, but that's the sort of innovation I would've liked to see from nintendo. instead they throw it away for that junky, confusing tablet.... I don't think the control scheme required that much improvement, simply adding a second stick on the right hand controller, probably just a nub, would've been enough for me. overall i was pretty happy technically with the second iteration wii pointer with higher accuracy.