Why, when most of the launch titles were tailor-made for the established Xbox/PlayStation audience, would the Wii U launch lineup be "totally fine" to the non-Xbox/PlayStation audience? That audience already rejected these games on Xbox and PlayStation. (That's why they don't own Xboxes and PlayStations.)
So you don't even think publishers should make Wii U SKUs, you believe publishers should be investing in
exclusive Wii U games tailored to the audience? That's insane.
The difference is this: No matter what the install base of those two systems are, you know for a fact that all multiplatform titles will be on both, and that all DLC will show up on both platforms. It doesn't matter that one is outselling the other by something like 3:1 worldwide. It doesn't matter. Both will get everything. With the Wii U, consumers were instantly wary of being treated like second party citizens from the get-go. Strange moves like Mass Effect 3, the delays of Need for Speed and Rayman, and the lack of big titles like Tomb Raider were noticed by many, and it's hard for me to say that the consumers are to blame when they know better than to trust third party publishers in this regard.
Yes, the XBO doesn't need to nearly keep pace with PS4 in order to maintain support, because making an XBO SKU when you're making a PS4 one is not especially costly, the platform is viable regardless of it's relative performance.
Let's take Tomb Raider, a simple HD Remaster from the PS2 generation generally came in at around a million dollars to produce. How much would you imagine porting Tomb Raider, one of the most technologically impressive games of the entire generation, to a brand new platform with only comparable performance to it's last generation rivals? Five million? Six? Seven? Let's go with five as a hypothetical, lets assume a two million dollar marketing budget for the port (practically nothing), at which point, this port needs to sell 260k to break even. If it was your seven million, would you be confident you make enough of a return to justify that project?
Your answer is to blame Nintendo, basically. So Nintendo should have to drop millions of dollars just to get everyone interested in their platforms? Do you expect the same of Microsoft and Sony, or do you expect third parties to just line up, deliver top of the line experiences, and never skimp on the DLC on either platform?
Blame is irrelevant, as is user expectations. Projections are all that matter, they are how these decisions are made. Publishers projected PS4 and XBO would be popular enough that combined with the PC, the three would form a comfortable technology baseline for all the next-gen engines to target.
The Wii U had to compete with all three combined, and it doesn't matter if that's 'fair' or not, and it doesn't matter if Sony or MS would have fared better in that situation or not, it's the practical reality the publishers faced.
I don't 'blame' Nintendo, the same way I don't blame Sony for fucking up the Vita, both companies faced extremely tough decisions, and personally, I think despite them both bombing, they actually each did what was the best for their awful situations. Personally, I would have not done the uPad and targeted a much lower entry cost, but no matter what was going to happen, the Wii U wasn't going to be supported like the others without being a comparable machine.