I think they probably will suffer some continued hardware erosion next generation. The 3DS launched at a point where budget tablets/kids have phones was not such a big thing, but the NX will have to face that from day 1, that is a steeper hill to climb even if it's a better product.
That said I think they will make much more money next gen largely because of smartphone games. If done reasonably well, Fire Emblem and Animal Crossing alone should clean up on the app store.
Square-Enix makes a lot of money from smartphone games, I don't see why Nintendo couldn't double or triple+ what S-E makes. I think NX itself will have custom version of Android too so you'll be able to consume smartphone apps on the NX itself (Nikkei has proven itself to be correct multiple times).
Movies are a wild card, they would need to hire a funny/clever writing staff like what the LEGO Movie had. Angry Birds has done pretty well but again it has a decent writing team.
I think Nintendo's focus there should be to start with a Super Mario CG movie that leads into a Smash Brothers series of films that can highlight other Nintendo characters. But it needs to be funny and clever, it can't be written by/for game nerds (sorry guys, but go look at Warcraft's box office).
If the console NX bombs quickly and is more Wii U than Wii, then I think they will shift over to making console games for the PS4/XB1/PC or having a joint partnership with one of Sony/MS, but continue to make the NX portable.
