Why do people still have faith in Wii U sales?

[Iyasu]

As I can't see into the future, I don't know how the Wii U sales are going to change.
So, for now, I will believe that things can improve a lot for Nintendo.

Who knows what will happen?
Maybe they will buy some new Studios and let them develop some IP's that are attractive to the masses of western gamers.
Maybe Xenoblade Chronicles X will surpass all expectations and boost the sales of the Wii U in Japan by so much, that other japanese developers are going to start to make RPGs for it, because XCX proved that there is a market for them, or it could flop or just do OK (I'll buy it anyway).
The Gamepad could prove to be the ultimate Controller for RPGs, Strategie or Adventure games.
(btw, I really liked it's use in Deus Ex: Human Revolution Directors Cut)

As I can't control how things will occur, I'll just let my wallet do the talking and look forward to the games on Wii U and PC that I'm interested in.

In the long run, I don't think that the Wii U will catch up to the Xbone or PS4 this generation, because Nintendo isn't competing with them, because Nintendo can't.
I think that the only way that Nintendo can start competing with Sony and Microsoft is not by buying exclusives from 3rd parties, or convincing the masses of gamers that all they really wanted was Mario, but to create their own and better IP's in the genres that Sony and Microsoft are strong in.

Games like Halo, Gears of War, Uncharted or The Last of Us. Games that will get the Call of Duty players interested in a Nintendo Console, games that are more "realistic".
Once they have these kind of games, and they sell well, 3rd parties will see that there is a market for them on Wii U. Nintendo can't hope for 3rd parties to make that market on their console, that costs too much for them. Nintendo has to create that market  for them.

At the same time, Nintendo still needs to create the games their current fans enjoy, with their beloved IPs, because there is a market for those games, and they should'nt give that market up.

In short, let the fans believe what they want. The future isn't set in stone and Nintendo still has cards to play.