Why are big third party blockbusters skipping the wii u?

[Iyasu]

 

etking said:

They system is too weak and not supported by most modern engines.

I agree with this. The Wii U is actually even too weak to support the Gamepad (or multiple) in a truly meaningful way.

It is expensive to develop for another architecture (PowerPC) if all other plattforms (PC, PS4, X1) use AMD64.

It shouldn't be too expensive, just not worth the extra profit most of the time. 

The Wii-U audience is too young and does not buy 3rd party games.

I disagree with the too young part.
Most Wii U owners are in fact older than 18. But, the Wii U audience that do not own another System and buy 3rd party games is pretty low.
I'll take myself as an example, own a Wii U and a PC. I try to buy 3rd party games that I am interested in on the Wii U, but I'll buy it on PC if the value is better (e.g. Mass Effect 3 (+DLC) on PC, NFS:MW U on Wii U).

The Wii-U user base is too small.

For most genres it is too small.

Nintendo's own games are too good and many 3rd party games cannot compete, so Wii-U owners buy Nintendo games instead.

I don't know about that, feels more like 3rd parties not advertising the games that compete with NIntendo games as much. They don't try often either.

If you develop for Wii-U as a 3rd party developer you loose money istead of making it.The Wii-U has not been successful and might get discontinued very soon.

You might lose money, make a little or have a surprise hit and make loads.
You'll lose money if you just send out a game to die (I'd guess Watch Dogs is an example. Was Watch Dogs profitable on Wii U?)
You'll make a little money if you make a decent port.
You have the chance of a surprise hit if you take a big risk and make a game that is more suited to the Wii U audience.

The Wii-U is heavily overpriced, so userbase growth is very low and many Nintendo fans or Wii owners refuse to buy the system.

Remember the Gamecube? Did it sell like gangbusters when they dropped the price to 99,-?
It didn't, so I'd guess that lowering the price of the Wii U wouldn't help it a lot.

Development costs do not pay off as all previous attemps to develop 3rd party games for Wii-U failed.

Stop generalizing. There are games that do seem to pay off.
Why else would the Wii U still be getting games like Skylanders, Disney Infinity, Lego Games or Just Dance?