If Nintendo had a good console on par or better (in terms of power) then ps4/xbone and they made it easy to develop for so 3rd parties could easily port to it I might actually consider buying it again.
As it stands, another underpowered no third-party system, no thank you. I like Nintendo games but I just cna't justify a 300+ console that will get playtime maybe twice a year for a bit and then collect dust in my closet.
But that's kind of the conundrum they've been in for a while.
You say you'd buy it, but do you already have a PS4/Xbox1/Gaming PC? If so, what's your incentive to buy an NX if it's equal powered and has all the third party ports? Would you really pay $400 for that? Even if you would, how many mainstream AAA gamers would?
Vs. them having a much cheaper box (assuming they go that route and don't overprice terribly like Wii U), that offers something that appeals to their fans and possibly as a secondary console to some core gamers who already have PS4s/X1s/PCs.
Even when they weren't behind the curve and tried launching equal power at a generation start with the GameCube they still failed to sell competitively. They just don't have the devs to make Uncharted, The Last of Us, Killzone, God of War, Halo, Gears of War, MLB The Show etc. to have exclusives that make them appeal to the mainstream AAA western gamer who's buying a console for CoD, GTA, Madden, Fifa et al. and likes that Sony and MS have exclusives similar in genre, tone, graphic style etc.
Point being, few western AAA gamers are going to switch from Sony/MS/PC to Nintendo even if they had equal power and all the third party ports. There's no reason to when they have no interest in Nintendo's exclusives for the most part. They're going to buy a machine where they can play CoD with friends, and also play stuff like Halo and Uncharted. Not one their friends probably don't have, and to play Mario, Animal Crossing etc. along with CoD.
Maybe if Nintendo had kept up what they had going with exclusives/timed exclusives on the N64 like Goldeneye, Perfect Dark, Turok, Conker etc. but they went totally away from the types of games the western AAA market had moved onto after that generation for some reason, and really leapt away from it with the Wii/DS.