Demographics likely play a major part too. Lets be honest, Nintendo doesn't really appeal to the "jock audience". Generally speaking most third party major titles are either A) Violent action games or B) sports/driving simulator. Oh and then you have wacky Japanese action game with girl with giant tits that will have to be censored in the US market causing the 250 people who were planning to buy it to rage out.
But that's kind of a microcosm of the market. Truth be told even in the Super NES days, EA's sports games while they did sell well on the SNES (so did things like NBA Jam) still sold better on the Sega Genesis.
Nintendo isn't "cool" in that way, so they struggle with these types of third party games because they don't attract the audience that buys them.
N64 was probably the last Nintendo system that really had some foothold of appeal to this type of gamer, but this is now almost 20 years ago since GoldenEye (!) and since then Nintendo has probably regressed backwards as a brand to this audience. Gone are things like Perfect Dark, Eternal Darkness, NBA/MLB games, Star Wars games, etc. and as wonderful as Splatoon is, it's not exactly making up for that style of game.
*Maybe* as such Nintendo should perhaps offer to pay for the porting costs of EA titles for the first year or two. Even though EA is far from perfect being completely shut out of the NFL, FIFA, and Star Wars licenses are fairly damaging and plus it will likely cause other big Western developers to back off from providing major support as well. Though Nintendo won't do it, and the results will be somewhat predictable.
They better have an amaze-balls gimmick for the NX and it better be something Sony/MS cannot copy easily, because I gauruntee one of the things MS/Sony would do over about that last gen would be to copy the Wiimote much earlier.
