Maybe this is happening because the Wii U software sales are flopping, they just want to at least sale a bunch of copies to recover from development expenses, and only releasing it in all consoles they have more chances.
Things are getting nastier for Wii U owners, and I guess a lot of people are at the fence just waiting who is going to be the next top dog, I just hope one day the gaming environment could be like this:
-Only 2 or 3 Consoles with same architecture from: Sony, Samsung and Apple (just guessing don´t trow rocks please!), and they should be cheaper like a tablet or smart phone. Just Imagine Nintendo going Multiplatform!!!!!!!!!!!!!!!!!
-AAA games from Nintendo, Microsoft, Sony (as publishers), and all major third parties and publishers games available for ALL consoles, all of them doing business as Steam and/or selling cards with codes at game retailers for those with no credit card for digital downloads. (I don´t remember any song or movie exclusive to a certain device, are you with me in this one?)
-Indie games and Apps like Netflix or Playstation Plus, android market, steam, etc... as exclusives to compete for customer preference.
-Selling the games in different prices and bundles so all we are happy with what we get ex:
A new game for the next gen console and different options to get it: Full price for the physical media (bluray or dvd) included with exclusive content, half the price for the same game as a download only. In that way if you have different ways to monetize from the same game game publishers and developers will be happy and we as gamers will support them in an easier way.
I´m just guessing but that could be a better gaming ecosystem designed to keep hardcore, mid-core and casual gamers happier and willing to keep supporting this beautiful hobby, and a better way to avoid this nasty way of trying to exploit people and driving them away from a good gaming experience.