I am really interested in the possibility of playing SSB on an arcade stick. With the current control options, that'd be a bit problematic, what with the importance of the analog stick. But with an option to change controls a bit, it might work with a control scheme like this:
One button for jabs.
One button for tilts.
One button for smash attacks.
Make dashes into double taps, and cancel into another dash simply by pressing forward/backward again during the dash (by holding forward while running, pressing a direction again could sort of overlap the input into another dash and a new one would start would start).
To be able to quickly cancel a dash and do a tilt, for example, you could be able to press down, which would cancel the dash.
To prevent the problem of dropping through floors (sorry, not sure what the term is), as there is no analog, you could, instead of quickly tapping down, double tap down. That way, you would be able to cancel dashes without having to worry about dropping through floors.
I think sonething like this could work. Though I'm not even sure if I'd like to play this way, but instead of making it mandatory, perhaps making it optional?
Also, when it comes to online. I REALLY hope that they don't think that matchmaking is the only thing that needs work. They must know just how important it is to have little delay in fighters.