the game doesn't have to be reinvented, it just has to be more than the same game, plus a bonus level and some items.
the camera is a gimmick. it's a function that has little effect on the gameplay, unless it is the main star of the show, in which case the game is a test demo, or a game to take advantage of this feature alone. if the camera becomes something useful in gaming, it will have to start as a gimmick like this, but I personally doubt that it will grow out of this stage, and will be like sony's eyetoy.
I don't see how heart gold/soul silver really added any ways to play, beyond the poke walker which (unless it is a feature/peripheral that they continue to use in new games) was just a gimmick. I bought it, but it's just a gimmick, and it's uses are limited. it's fun, and I play/use it more than I play the actual game, right now, but that doesn't mean it will be implemented in the future, or that it is anything of value when considering the game/series on the whole. it's the pokemon pikachu (2) remade, and it will be as remembered as that device was in enough years/time.
curious, honestly, what did city folk add to the game? DLC every now and again is one thing if you want to count that, and there was the city (which is just a few buildings for things that existed in the city, if I'm not mistaken, if I am, correct me), a fountain, which was in the game, but removed from WW, and... gogogo.
my point to bringing up valve at all was the sheer amount of content and (free/no extra fee) support that is given for the price, compared to any nintendo game. the only one that comes close is probably animal crossing, because the game can be replayed and customized near-infinitely, if you have the time/patience.
Nintendo needs to innovate and re-invent their franchises, or else they are going to be stale when bought every year. I like that the legend of zelda usually only has two games per console, meaning one every 2 and a half years, roughly (I think? correct me if wrong)
the pokemon games are getting a little out of hand though, if anyone was surprised at that.
and at this point, I say...
I really want to finish this conversation, but I'm a lazy, lazy man.
that, and I've had this one post open for a good thirty minutes, and forgotten/lost my train of thought.
basically, no game NEEDS video chat, whether or not it's used/optional, and nintendo needs to stop trying to focus on these "features"/gimmicks, and add something to the real game, for people who still care. not that they aren't already doing so, but that they need to, and a lot, before they lose their devoted fanbase.
like that'll ever happen. lol
edit: OH SH- tye's 19/almost 20? you could've fooled me, sadly :/
Psychonaut is also 19, though just freshly/recently