Hey so earlier someone was talking about Subspace Emmissary, so I'll throw my hat in the ring.
I didn't like subspace emissary. It's story was not good, and it didn't take advantage of the possibilities of having all those characters interact with each other. I also suspect it diverted a lot of development resources that could have been used on characters and stages.
But the idea of a story mode in smash is a good one, so here's how I would go about it.
I would combine the story mode and event matches. The characters would interact before and after fights with special rules (Depending on the Narrative), in a Fire Emblem dialogue-esque manner. Huge original stages need not be created for this, all the events in the story would take place in the stages already in the game. I think my system would both take a minimal amount of development time, and allow for more exciting, meaningful interactions between the characters.
What do y'all think?
One reason (of many) that I'd love another story mode is that it would allow hidden characters to stay a secret for me.
Let me explain.
Let's say Smash Switch launches, and there's confirmed to be about 5 unlockable characters that have yet to be announced to us.
I'd like to unlock those characters and have them revealed to me while playing the game, rather than just going online and just reading "______ is playable."
If those characters are unlockable through random criteria like Smash 64, Melee, and Smash 4, I'd probably just have to look it up instead of mindlessly try every mode over and over hoping for a character to pop up. Even if I did play nonstop, I'd probably be spoiled before I have the chance to unlock them.
If there's a Subspace Emissary-style mode, it's a different story. I can just get home on launch day, and play through the story non-stop, and come across the secret characters naturally as I progress. I can grind out a 10-15 hour story mode in two days while avoiding the internet. I can't grind out 10-15 of guessing doing what in what mode might maybe unlock a character.
It really just boils to this. There are two scenarios.
1. You're playing through a story mode with all the main characters, when a cutscene starts. Suddenly, out from nowhere, King K. Rool, hell maybe even RIDLEY, swoops in and attacks you, triggering a fight where it's obvious he's an unlockable character and not a boss. You didn't even know he was in the game, and now you're face to face with him, fighting to unlock him, with story context.
2. Mindlessly playing multiplayer modes by yourself for hours on end, before giving and going online to simply read "K. Rool/Ridley/whoever is playable and you do this to get him," or just getting spoiled before you have the chance to maybe stumble upon him.
Which would you choose?