I think a lot of people here are forgetting about the planned connectivity between the 3DS version and the Wii U version of smash, tho we still don;t know much about it allegedly it supposed to allow the transfer of data and unlocks. and considering the fact that it would be foolish if nintendo caused the 3DS version to wipe itself upon being transferred to the Wii U version (ala the Wii U transfer system), I suspect that we will be able to use our 3DS versions of smash to quickly unlock content (especially considering that the sets of content we want [characters, special moves and possibly equipment] will be identical with both versions).The only thing I'd be concerned with is that it seems you have to unlock special moves, which may prove to be a hassle for tournaments to organize.
That said, custom moves definitely seem like they could help breath new life into the metagame. I'm also sure there will be a fair amount of people who'll want to play as Mii Fighters, and banning custom moves would mean we'd have to probably ban them.
oops.... wut he said! :D\We know for a fact you need to unlock the moves, but it won't be a problem early on because it'll be 3DS only. And if we can transfer stuff like that to SSBU, we'll be set.
so from the extra credits video (love thos guys), a cyclical imbalanced game system would be what we would want in smash, right?Well, it's handled linearly in the post to point out that this makes more characters viable than they would be otherwise by lowering variance. It goes without saying that there might be one or two moves that are circumstantially good (although, in most cases, when a player is given choice, one eventually comes out as the overall best after enough time with the meta-game. It's very hard for two different abilities to be exactly equal in usage).
Even then, though. That just makes the general point even better, because that gets into the concept of perfect imbalance. Extra Credits did a good video on this one.
By having options that will work against specific builds, you get an ever evolving meta-game instead of a static one. This drastically increases the viability of lesser used characters and reduces the effectiveness of tiers.