The Wii U isn't getting games due to the hardware, it's not getting the support because of the marketing. Yes, I won't deny that that the Wii U isn't as powerful as the other consoles, but that is NOT why games aren't coming.
Hardware is vital, I can agree on that, but that's where that agreement ends. To assume that no multi-plats are ever coming to the Wii U now or ion the future is a pretty bold assumption. I wish people would stop bashing a console solely based on it's hardware. To label it a complete failure is also unsubstantiated when compared to the Virtual Boy.
Seriously? When developers develop a multi-platform game, they usually start out with the Sony and Microsoft consoles. After creating it for those platforms, they then port it to the other platforms (PC and Nintendo).
During this generation, porting to PC is very easy as both the Xbone and PS4 have x86 processors, the same architecture as modern PCs. PCs also have the most processing power, which means that no compromises have to be made in the code.
Porting to the Wii U from the Xbone and PS4 is a different story. Firstly, the Wii U uses a PowerPC CPU, meaning that large amount of modification will have to be done to the code. A entirely new game engine may even have to be utilized. Secondly, the Wii U lacks the power the other 3 platforms have. This means that textures will have to be sunk, models will have to be reduced in polygon count, particles will have to be removed, etc. The UI will also have to be modified to accommodate the Wii U gamepad. This can be a lot of work. Sometimes developers will simply choose not to port to the Wii U due to this. Other times, the developers will find that not matter what modifications they make, the game won't run well on the system. That's when the Wii U won't get a port.
Certain developers (CD Project Red, etc.) start out with PC and then port to console. A similar occurrence happens. It's easy to port from PC to Xbone and PS4 as they all share the same CPU architecture. Attempts to port to Wii U will evoke the same problems stated above.
Just take a look at how behind the Wii U is in processing power:
GFLOPS = Giga Floating-Point Operations Per Second = raw processing power
Wii U: 350 GFLOPS
Xbox One: 1300 GFLOPS (A big higher now since MS decided to overclcok the GPU)
PS4: 1840 GFLOPS
Average gaming PC (GTX 660 Ti): 2460 GFLOPS