It's just an idea I'd love to see in the Wii U version, and it would completely cement the game as my favourite Smash game.
Basically, you know how we aren't getting a story in this game?
And you know how people eat up full length Mario platformers regardless of whether or not they have any real story elements?
Well, why not just make this grand scale adventure mode - that has no story?
Picture this...
...except every world is based off of a represented Nintendo franchise. And you have a party of up to four characters on screen at any one time (meaning four players can also play).
The main levels would play much like the Subspace Emissary levels, but of course, they would be based off a level from the franchise the world it's in represents.
So like "World 1" could be the Mushroom Kingdom, with Mario themed levels, "World 2" could be Hyrule with Zelda themed levels, etc.
There would be about 3 or 4 levels for the bigger franchises like Mario and Zelda, and 1 or 2 for the smaller ones.
And as well as levels, there would be some bosses, and enemy road blocks. Another idea I have, to help expand the overall scale of the map, is to integrate "Event Matches" from past games, into this mode. They could be hidden about the map in secret locations or whatever, and they would take place on the regular versus stages, like in past Smash games.
There would also be RPG elements. Basically, take the stat boosts and such from Smash Run on the 3DS, as well as stuff like the equipment and Powers, but make the stat boosts a customisable variable from the World Map screen. Depending on the character's level, they have more points to spend on boosting their speed, defense, power, etc.
The way I see it, Smash 3DS has a Subspace-esque, RPG-lite mode in Smash Run. Only, it's small scale, and it's competitive.
However, this mode would take some elements and assets from Smash Run (like enemies and the red doors from Subspace), and put them in a huge game mode for Wii U. And instead of being competitive, it would be co-operative.
Oh, and of course, it would be online.
Another thing about a huge mode like this, is that it would make Amiibos even more useful, so you can save your Super Smash World customisation, and take it to your friend's house.
...Now I want to make a logo for this thing.