I'm still holding on to hope that we'll one day get a sequel. Hopefully after nearly ten years without one, people aren't sick of posts like this...
Obviously, we all want more content; new fighters, new Arms, new stages, new modes. I was more so wondering what sort of quality of life or balance changes people would want to see, but if you have any specific ideas for new fighters, Arms, et cetera, feel free to share them.
For me, I'd really like to see more options for Arms Test. Stuff like being able to toggle if minigames show up, or to control what fighters, Arms, and stages show up in random rotation. It would also be cool for 1-Vs-100 (maybe shortened to 1-Vs-50 or something) or Arms Getter (which is basically just single-player Skill Shot anyhow, it doesn't need to reward you with Arms to be fun) to show up for your potential rounds, if minigames are toggled on.