Lemme just break down my logic here.
1. The 17-35 Western male demographic coveted by AAA third parties is already being exceptionally well served by Sony and MS.
2. Consequently, the only chance Nintendo has of making any real inroads with that demographic is with significant exclusive content targeting that demographic.
3. The only way to secure such content in time for NX launch would be if, several years ago, Nintendo had started investing massive amounts in first-party Western development well beyond the scope of their partnerships with the likes of Monster and NLG, and in moneyhatting third-parties.
4. In the past few years, I haven't seen a single rumor indicating that any such investments have been made, and it seems unlikely that they could keep such a huge sea change in their approach to Western development under wraps entirely for that long.
5. Consequently, I expect that NX, as with the last few Nintendo consoles, will have little to no exclusive content aimed at that demographic, and thus no real hope of making inroads into the Sony/MS market.
They have literally no chance of being considered as a credible alternative to Sony/MS if their advantages are limited to slightly better graphics and "our system has both CoD AND Mario on it!" Period.