I agree with you. Maybe I'm just in a different phase of life than most of the people on this board but I play my Wii U more than my PS4 or PC these days, mostly because I can play it with my 2 kids. My son and I still occasionally make Super Mario Maker levels for each other to beat and if we play Super Mario 3d World, all 3 of us can play together with me using an old Wii-mote and nun-chuck. My son just discovered we own Donkey Kong Tropical Freeze so we've been playing that too and he's been asking about Smash Brothers because he saw a video of some kid playing it on Youtube. I could see us just sticking with the Wii U for a while even after the launch of the NX.

As far as the NX is concerned...
Will I buy it? I don't know. I've just accepted the fact that I'm going to be behind the tech / gaming curve for a while due to kids and other responsibilities so if I buy one, it won't be at launch. I also know so little about what it actually is.

Will it succeed? God, I hope it does. I think the gaming industry is better off having Nintendo be the crazy outsider doing their own thing, so I hope it's profitable for them if not an outright phenomenon.

Is this Nintendo's last console if it fails? I really hope not but maybe. I know everyone keeps saying they should just go third party but I prefer them being in control of their hardware, specifically their controllers, and I'm afraid they'll lose their identity if they give that up. They have a history of pushing gaming forward with the NES, SNES, N64, and DS. I also really liked the Gamecube controller and the Wii U gamepad. I have mixed feelings on the Wii-mote but it could be a lot of fun for the right games.

Does Nintendo morph into a hand held/mobile company if it fails? Maybe for a much smaller market than what they're trying to serve right now. I could see myself buying the kids a dedicated handheld gaming console rather than just giving them my phone when they're bored, but I think I might be in the minority there considering the number of kids I see on their parent's iPhone's while in Dr's waiting rooms and restaurants.