I think the only game Nintendo could have shown that would have registered a positive blip of interest from non-Nintendo gamers that we already know about is Monolith's X
A trailer, highlighting the epic scope, the online, etc
Everything else Nintendo does is only relevant to the Nintendo gamers who are already good at keeping themselves well informed.
In fact I think what Reggie did is basically slap hard any of the Nintendo fans that do expect some "core" appeal games by having Retro go up there and show a new character for a DK game with two boring stages.