I mean renaming the console to something else (with or without the word Wii in it), repackage it with a different look and kick off a new marketing campaign. It will definitely add more confusion to certain degree but considering how the mainstream still sees Wii U as a peripheral it's a risk worth considering.
if they're going to just be rid of the wii name entirely, then why not do it in a couple of years when new actual hardware is out. if they do it now and if it's successful, they might have a difficult time getting people who thought they were getting a recently-launched console to buy another. or if they plan on slimming it down and relaunching it, then maybe they should make it their new hardware similar to what the wii was to the gamecube. either way, a 2015 mid-replacement (even from just a marketing standpoint) screams sega 32x to me.