Besides looking at the game from a mechanics perspective, something that I thought about that shouldn't be overlooked is macro issues that could affect the competitiveness of Smash 4. Nintendo has clearly been trying to instill a competitive spirit into their games prior to release. Whether this is just a strategy to promote the game and then they'll be disengaged after release, a "hit it and quit it" if you may, remains to be seen, but this could also be a harbinger of things to come. If nintendo really starts to contribute serious resources to competitive smash, it could only increase the "competiveness" of smash 4, for both editions. I'm not saying it's going to be like the national pokemon championships, but it could very much be like the early stages of the pokemon league. Back in 1999, nintendo did a series of tournaments on the road for red and blue. I could see nintendo doing this starting out, having tournaments for both versions of smash 4. This leads into maybe having their own major championship again at E3 2015, but with no-nonsense rules this time. They could cause people to come out in droves. Of course nintendo's tournaments operate independent of smash's competitive scene, but if nintendo does gangbusters at their own tournaments, it could result in organizations like MLG getting behind smash 4.
This version of smash has the potential of getting more people into smash and wanting to play competitively than any other installment. Two consoles, one mobile, one hd, online (please be good) with friends, online (please again) for glory. The gate to entry is HUGE. If nintendo backs it, it's just a matter of time until promoters want in on that growing base because ultimately, they want as many people attending as they can having a good time and coming together. Also people want to go where the $$$ prizes are. If big promoters with cash are promoting smash 4, it'd be hard pressed to not want to compete for that. Nintendo goes the scholarship route with pokemon, I could see them going that route if they got that serious too.
So maybe, instead of just determining whether or not a game will be a good competitive game based on the proportion of offense to defense, we should additionally ask ourselves if the game will be good competitive game because of the accessibility of creating competition in of itself. Maybe this will all come to pass, maybe it won't, but I just thought it was an alternative to the consistent, but also necessary debate on game mechanics.
Ultimately, I'm excited just to destroy scrubs online on two consoles and in the midwest. The more the merrier!