By people do you mean people who play video games or the audience that bought the Wii? the people that bought into the wii don't care. Three years that controller was incredibly. Play it with anyone who isn't a total nerd about this stuff and they'll notice it, but not really care much. Motion Plus is an improvement, but even it wasn't needed for the majority of Wii owners to get what they wanted out of it.
For people who play video games, yeah, accuracy and better control matters. Whether or not a more accurate/better controller means they'll give up dual analog for motion controls remains to be seen. I mean, Modern Warfare 2 and the majority of big games on the PS3/360 use dual analog controls and everyone is fine with that. Technically things like Rock Band and Guitar Hero are motion control but they aren't general purpose like the wii remote, natal, or this sony thing. I dunno.
yeah, tech demos. I mean a game, like something you would want and could buy when this thing releases. Tech demos are still appealing to the nerds and others who follow this stuff.