I've been saying it's inevitable. There's no way the NX will get a smash bros, not when so much is invested in this one and is still getting content. They will re-release it for NX, as an ultimate edition with all content, and it will include the 3ds stages, possibly smash run and more.
But quote me on this and save it, "THERE WILL BE NO NEW SMASH BROS FOR NX"
I'm not going to argue with anyone either.
https://www.youtube.com/channel/UCbchUmHiEvZ1m3b9HgW5syg
VIDEO GAME MUSIC MASHUPS