I think he'll stick around at least for one more year. I think the final smash updates/DLC will come late next year and then the game will be "done." By then all Amiibos should be out, along with Mewtwo and probably one more character (my bets on Wolf).
I see a few things they will sell though, since I doubt we get much stages or characters as DLC. The GUI isn't made for anything more than 2 DLC characters on the Wii U, and fitting anyone else will be really hard for that GUI to adjust. You can't have pages on the Wii U. There isn't room for stages at all (other than MiiVerse), but those have some padding they can adjust to fit maybe an entire new row (but they won't add that many).
I believe these are coming
Wolf
- To be released with Star Fox U, first runs of Star Fox U come with a DLC code for Wolf, or he's sold on his own.
- He fits into the GUI cleanly
- He was an unjustified cut from Brawl. Every other cut Brawl character has been given a reason for being cut except Wolf.
- The second and last DLC character imo. I could imagine a Roy bonus for owning both DLC characters, but it doesn't fit at all in the GUI, and a character locked behind two DLCs seems wrong and not something they'd attempt. I pick Roy because he's the easiest cut vet to bring back, and would make quite a few people pretty happy.
A couple more retro stages from 64/Melee on the Wii U.
- Fountain of Dreams music missing is just too suspicious. Sakurai loves this song, he's used it like 4 times in other Kirby games.
- Sector Z works too well as an 8 Man stage, and there's a lack of a Great Fox stage on the Wii U, a series tradition. Maybe this is just my own projection of my wants lol.
A hazard toggle, billed as "Use All Star Version"
- They've added a number of 8 player stages recently without hazards, but also snuck them into All Star mode, which is super suspicious, especially on stages that previously were already enabled in All Star (like Pyrosphere and Luigi's Mansion), so it doesn't seem performance related (and All Star worked fine performance wise before these changes).
- It seems maybe they're slowly trickling these maps in to limit download size.
More alt costumes, sold in packs, with an entire new character costume as a bonus for owning all packs
- Nintendo always offers a bonus for owning all packs and sells DLC in packs
- The alt-character costume system is horribly underused and is a good way to add characters easily that otherwise couldn't be in the game (like Daisy, Bass, Dr Luigi, etc).
- Costumes are as simple as a texture swap, although some actual, proper costumes would be nice.
Possibly a music update.
- There's a ton of weird music cuts from Brawl. Stuff like the map music from DKC and Fountain of Dreams that can't really be attributed to licensing. A few songs from the 3DS are also missing (1-2 remix, 8-bit Kirby Medley). Plus direct game rips are super easy. It could pad out some content and make Master/Crazy Orders more rewarding for people who have played it to death.