The problem with this question is that the PS4 and the Wii U are fundamentally different with regard to intent.
The PS4 is designed to be a console that attracts third-party publishers and developers. It was created with ease of development in mind. They gave it the horsepower that developers were asking for, to at least bring it on par with the closest competition, if not exceed that level. They increased the RAM available by a significant amount. They changed the architecture to stream-line the development process in order to attract studios looking for a platform and to ensure that ports suffer no loss of quality. Sony (and Microsoft) bend over backwards to MAKE SURE their consoles fit the needs and desires of publishers and developers. Nintendo makes the device they want to make for their own vision then asks outside developers to work around that vision. Now, I'm not saying Nintendo's approach is wrong, just that it's not the same as how the other two manufacturers operate.
So now, what are you asking exactly? Are you posing a hypothetical situation where none of that is true, and Sony instead created something like the Wii U? While Nintendo produced something closer to the PS4?
I think the difference you would see is that a lot of Sony fans would feel betrayed by Sony and would switch over to Nintendo or Microsoft. Rather than complain about third-party developers, they would be angry that Sony had changed their focus. Sure, a few loyalists would say "I had third-party games anyway" or simply blame the publishers and developers, but most would hold Sony accountable for not doing everything they possibly could in order to attract those publishers and developers.
I'm not sure that's the answer you're looking for but I think that's probably how things would play out.
