How much will other modes add, though? I can understand improving online (which is why I was hoping for a Global Test demo), but there's only so much you can do with the core gameplay that they haven't already done. And even if they cone up with something, it will probably end up as a gimmick like Pokémon's Mega Evolutions.
I always think in something like a mix of Subspace with the quality of the last level World of Light, with levels that reminds us other modes of Smash like break the targets, Smash Run, Multiman Smash, with Bosses, auto-scrolling and not auto-scrolling levels, levels based in levels of games represented in Smash... jesus I can think in so many different things that could make a campaign game something big and interesting... of course that in this bag of possibilities, they must find a good balance to create a great campaign.
This isn't really gimmick, it's a full campaign. Of course this is too much to ask them to develop as DLC for Ultimate, but for another Smash, a campaign and better online is a must. At least in my opinion.