Ok this is just my opinion but I think adding new characters to the fray is a terrible idea. Save those for the next game. But a great idea that I've thought of is why not add all those Melee/Brawl/N64 stages we've loved in the past and fully remaster them in HD? I personally would love to see the original 9, and they could sellfor maybe $7.99 bundle or 99 cents each. With Melee, we could see all of them (except the ones already used) put in a bundle for maybe $14.99-$16.99. And then all the Brawl stages in a bundle for like $19.99. Every stage individually 99 cents, and an ultimate bundle once all were released for $29.99-$39.99. I think it would be awesome! Or they could create a season pass for the game. Anyway I think this would be awesome other than wasting ideas on new characters and stages. Save those for the future

You can build stages.

We have a "STAGE BUILDER"

I wouldn't pay money just for stages. Unlike Mario Kart, for example, I don't consider that expanding the amount of game content.

I'd rather have characters.

Exactly. smash get its value from its characters, not it's stages. Like any other fighting game.

The DLC will probably add mods and characters. We have a stage builder already.

My first idea for DLC would be

BE FREE OR NON-EXISTENT.

Why?  What's wrong with DLC at a reasonable price on a game that was a good value to begin with?  

I think if we learned anything with League of Legends is that characters can be a very popular commodity. Killer Instinct (2013) also follows a similar formula i believe.

And First Smash DLC is Mewtwo =P

Amiibos could work as a way of unlocking too, as they do with the spinner in Hyrule Warriors. This way Nintendo could sell a new character for $12 (instead of KI $5), and since Amiibo utility is not restricted to only this, it could work.

I get what you mean, but it is extra stuff. I think they should do someting simiar to the free Mercedes Benz DLC first and later release resonably priced DLC.