I understand that it seems to be logical move for the business. I understand why people believe that we are going to get a lazy port job. Apparently people forget the fact that Sakurai is one of those proud developer, and he implied that he's pretty much against the games being re-released for future consoles as I mentioned it early today. If anything, it could be tale-telling for Sakurai and Smash NX. That's big if we are getting best scenario here.
Also, people do forget that Sakurai really love Smash Bros franchise because he felt that the Smash development may be one of most interesting thing that he could have done with, like working with other third party companies for their contents. If it wasn't for Sakurai's love, we would have got Melee with online mode for Wii, and who know what we would get for Wii U.
Also I urge people to realize something on this matter,
if we didn't get any new contents for Smash NX, then we wouldn't get any new contents until next generation console, but that's big if we are getting next gen console because the video game economy and industry are constantly changing every year so we can't really predict the future.
They are getting the team together for Smash NX right now, so they are not going to decide to get together again in couple of years because Namco need their teams for other products as well.
Also
Splatoon is one of most hottest IP that Nintendo miraculously made right now so I think they should include Inkling in Smash Bros NX when it's still popular because we know many fans would buy the game. And there is Ice Climbers too.