Because they can make money with their games if the console is successful?

That is true, though the low power makes the money threshold higher than it would have to be. So basically, the stronger it is, the earlier 3rd party devs would jump on it because the ports are cheaper that way.

A lot of the games Nintendo invests in for the sake of "diversity" don't sell anyway. Things like Bayonetta, Devil's Third, Ninja Gaiden: Razor's Edge, Pandora's Tower, LEGO City, Sing Party, etc. What's a few more bucks to have some actual well known brands like NFL, FIFA, NBA. These brands appeal to every demographic even to kids, and with the Switch being portable at least there is some reason to potentially choose these games on Switch. 

Sports games are also not the most visually intensive games either. So that genre I think Nintendo would be wise to put some investement into. 

Part of Nintendo's problem is modern Nintendo is notoriously biased against Western developers. They'll help out Japanese devs and collaborate with them, but very rarely will they even lift a finger for Western developers. In the N64 days they had no problem working with anyone, it's only after Minoru Arakawa and Howard Lincoln left that Nintendo shifted into its Japanese shell. Maybe the Rabbids x Mario game is a sign they're finally willing to shift a bit on this, even though that's not a collaboration that's really going to move hardware. 

if you look at that list closely, it's really not that much. Lots of those names are indies, smaller studios or even just middleware companies. This will probably go like the wii-u all over again. Support at first that just dies out after an offering of old ports no will care about. It 's gotta get the upcoming titles, not last year's titles. It has to have the games ppl are looking forward to playing. Not the ones they've already played. 3rd party support is going to be terrible from the get go. HOWEVER, i do have hope. That hope being that we see an unprecedented amount of 2nd party support. Rabbids x mario rpg will hopefully just be the tip of the iceberg. I think hyrule warriors really shows the potential for sales with this business strategy in mind. Also, for the 1st time in over a decade, nintendo 1st party titles should really shine this time. And i don't just mean mario an zelda. If they do a star fox, it'll be great. If they do a metroid, it'll be great. This is the 1st time in years that a nintendo console has no control constraints. I'm excited.

Because the Switch is fucking better than the Wii U in every way!

I would rather have the Switch Portability than that 2 player mode. Because I hardly play console games with people now. 

Because having Wii U and PS3/Xbox 360 graphic level on mobile is cool .

If it were really just a few more bucks third partys would already be putting their games on Nintendo systems by themselves, so I can't believe the cost is insignificant. The niche games Nintendo invest in can't be played anywhere else atleast, so I'd rather they stick to that instead of trying to get games I can already play on PS4.

I just think you're going to have problems with a truly mainstream platform without sports games. Sports are kind of a big deal globally. It makes your platform look amateurish or at least like some Disney fantasy in Nintendo's case ... just mascots all over the place and nothing but for the most part. 

I have a PS4 too, but I can't play NBA 2K on an airplane. 

Problems doing well? Nah, 3DS did well enough without them.

So, just play something else!