It very normal that people are exited about new console and excitment leads to hype, people just need to keep expactions realistic.
Also: "This is going to lead to an utter disappointment when it is announced and another failure from Nintendo"!? How you know this will be onother failure from Nintendo!? I can say this will be onother huge suces for Nintendo, but reality is we cant know.
And Nintendo is expanding their business, Amiibos, Mobile games, Theme Parks...
Also, about Poll, I will buy if there are good Nintendo games, and most Nintendo fans will do same.