We'd rather they didn't put them into the game to begin with. Microtransactions are basically an extortion racket disguised as a game mechanic.
The way I see it is that they're just going to waste their own extra time and resources to garbage I wont even buy :P
All micro transaction affect games. The games are always designed around them. If they weren't, people wouldn't buy them.
Well they say its most likely costumes so I doubt that'll affect their design of the game. I've experienced my share with Capcom and their million DLC skins for Street Fighter and Resident Evil so I'm use to this.
I'm used to it too, but that doesn't mean I'm ok with it.
Sure, Nintendo does DLC too, but they at least make DLC that I actually want to get.