They already said that a PC is better. PS4 and Xbox One are like low-end PCs. I think with this they want to say it again: Buy a PC with our products. 

Nintendo isn't about making a great gaming experience only with power, graphics etc. That's not Nintendo but it's NVidia. I only see differences and why mention a company which had sucess with the Wii with worse technology. Worse technology which the Wii U has, too. You can't make the people buy your products with a lot of power while you are saying that there's a company beeing successful with the opposite. There are people having a lot of fun with worse technology. The people would say: "So if I want fun in my gaming experience I won't need your better products?" and who would do this?

Yup. WiiU and Wii before aren't exactly known for their $100Mil games, hence it makes no sense to include them in a presentation about the problems of $100Mil games.

Some people are so fast to throw out conspiracy theories T_T

Exactly.

Why would Nvidia mention the Wii U for the graphic and the point they're trying to make?

I love my Wii U, who cares what Nvidia thinks

isn't the tablet there to include the wii U

In this case they want the number to be as large as possible to show their point. Lots of games do cost that much if you factor in every expense, but a lot are much cheaper as well.

They were talking about next gen hardware, and all next next gen consoles are present in that pic. I still don't see what the big deal is.

Not all. Wii U is next-gen do you like it or not. But that was not the point here

anyway I'm disappointed. I thought another person made the OP

Ever since the N64, Nintendo have been working with ArtX (even if this company has been gobbled up by ATi, which was then consumed by AMD).

nVidia would prefer that Nintendo didn't exist, so this news isn't suprising...