If they were to go up against the PS4 and One in 2017, would that make any difference? That would make it even worse since they would have an even stronger hold on the market by then, trying to wedge in a third wheel after four years is a ridiculous idea.
OP makes the same supposition that the NX will be a very direct competitor to the PS4 and One, I'm not so sure this will be the case, and thus the whole 2016 vs 2017 debate loses value if these are the parameters set for discussion.
In short; what the PS4 and One do is unlikely to have a huge impact on the NX since it is very unlikely to aim for the same exact audience. As for chasing proper 3rd party support; that ship has sailed nearly two decades ago, and Nintendo know this, that is why they've been talking about a unified structure in their software and hardware divisions, to lessen development time, budgets and have a bigger total offering on each individual platform in the end.







