Its very odd to me that some people want Nintendo to go way of Sega, I dont know if those people know that todays Sega is only shadow of once grat Sega that made consoles and great games.

And how will they earn with out a 50 + m selling handheld ?

How will they earn with both their user bases crumbling beneath them.  

What are you, like 12 years old?

Nintendo arent as dumb as many here like to believe, hence the reason they are branching out into mobile. They can use their popular IP to reach millions upon millions of mobile device users (Pokemon go is going to be huge), whilst also having an audience for dedicated gaming devices, in which their is always going to be that hardcore crowd. Add this to giving more freedom of their IP to other venture such as the Mario movie, theme parks, tv shows, merchandise, toys to life (Amiibo is a huge success which has room to grow)etc actually suggests to me that Nintendo are in really good shape going forward. 

Of course Nintendo should do third party! It's one of the reasons they've been tanking so hard. The same 60+ year old Japanese men can't run it forever. They need to make some serious changes 

Whata re you like 10.  Cant accept reality ? every one these days accepots that fact.

If you cant accpet wii was a fad and you honestly think next nintendo hardware can do such numbers then all is.  I will laugh hard when capcon owns zelda and MS mario.

I see a lot this argument... Sega and Nintendo are not comparable in any way. They have A LOT more fans and regarded franchises so I don't see them failing they way Sega did

Who saying that will not have 50m+ sold handheld again, or that both users will crumbling beneath them!? Nintendo is preparing new NX platform that probably will be unifed and basicly they again aiming to pull onother Wii.

Also Nintendo is famous to make profit from almost everything, that's why in their entire history they had only 2 years of loss.

Remember when people said, "the strongest hardware will never win a generation," simply because it hadn't happened before?  I remember that very well, because I thought it was a bad conclusion with very little in the way of logic to back it up and I often argued that it was nonsense.

In this case, Nintendo is a much different animal than most of the examples you mentioned.  The position and situation they are in now is barely comparable.  Especially Sony and Microsoft.

As far as games go, we probably would not see projects like Bayonetta or W101.  However, Fire Emblem and Xenoblade are owned by Nintendo and it's quite possible they would continue.