I think it's going to be hard to convience a Xbox/PS4 owner that they need a NX too, or that they should choose one over the other two. I don't mean forum users , but people who like to play FIFA, COD etc. All my workmates have a PS4, they don't even know what a Wii U is. 

Unified platform means far better and more focused Nintendo support for one platform than divided support for two separate platforms, that means more games and platform that is more attractive to consumers. Also this gen we already saw Nintendo cant effectively support two different platforms, that's a reason why they going with unified platforms.

Saying that despite unified platform, I think some people will still buy home console and handheld because they provide different experience, playing one game on home console when they are home and play same that game on handheld when are not home. More important NX home console and handheld will very likely have heavy integration, that will definitely convince some people to own both devices. Also I dont think every single game will be for both devices, majority definitely, but there will still be some handheld or home console exclusives. So there will certainly still be people that will own both devices, if handheld and home console integration is great maybe larger percent of people that will own both devices.

Honestly nintendo are really slow learners.... ei the hardware issues alot of their consoles has had, simular mistakes repeated multipled times ect.

One thing that you're not taking into account is the potential sales of people who own neither a 3DS nor Wii U. Let's say someone is interested in a few 3DS exclusives (Pokémon, Animal Crossing, Fire Emblem, Monster Hunter, etc.) but that's not quite enough for them to buy a 3DS. Now let's say they are also interested in a few Wii U exclusives (Mario Maker, Splatoon, Xenoblade X, Bayonetta, etc.) but that's not quite enough for them to buy a Wii U. But what if they could get all those games on a single device? Wouldn't that person be more likely to purchase a piece of Nintendo hardware?

And if the Dreamcast 2, also came ou in the same time ? (2017).

Honestly it would be awesome if the NX fails and NOBODY buys it so Nintendo "must" go Third Party, damn yeaaaaah !!! Now that is something that would be awesome as hell !!! ;)

I think it nearly impossible to repeat all mistakes Nintendo made with Wii U again, especially because after terrible Wii U sales with NX they will much better job in order to have much better sales.

When we talk about NX sales, IMO only certain thing is that NX will have much better sales than Wii U.

Pls ignore, we will again start why Nintendo should or not go third party. :(

The Wii U has failed, there is no hope for Nintendo to compete with the PS4 and XB1. The NX is a next-gen console so it should be compared with the PS5 and the XB2... even then it will fail. It will be released way too early.

To be pretty honest, its all up to how sucessfull ps vr will be. If it fails, but sony keeps pushing it, some people migth feel they need to go for another device for their good old gaming, and maybe...

nintendo...(ha)

device...(haha)

gonna be that!(HAHAHAHAHA)

But seriously, in the same way that xbox flip and switch gave a lot of momentum to PS4, someone need to something really shitty to put the consumers of today away. Having the console that your friends have plays a big part on deciding wich console you will play on, and 50 mil people alreadly have the PS4 and XB1