I don't think it'll sell the way Mario Kart 8 sold but I do think that if they put some serious advertisement out around this game, it could sell incredibly well and help get people on board that are thinking of getting the WiiU.  I personally think that if NIntendo puts big advertisement behind there games and focuses on the game rather then the fake family crap, it'll sell well.  Also, because it's a new IP, they'll need to start advertisement for it early, not the month of.

That's my point those two moved some consoles so why can't this.

Hype, marketing and the PS4 is completely different than the Wii U. Everything seems to be able to boost the PS4 to some degree.

^This. (I figured someone had already said it.)

It absolutely will NOT be a system seller at first. No new IP ever is. However, if word of mouth spreads excitement over the game well enough, it could become a system seller later. See Pokémon generation 1. It started with abyssmal sales, but word spread and it grew out of control to be the one Nintendo franchise that can consistently compete with Mario at his best. I don't expect that with Splatoon, but I do expect first week sales to be horrible and look rather like a flop but the legs to grow and eventually sell systems.

coughDestinycough

I know that I am planning on doing the same thing, I just don't have enough money for a Wii U right now.

dont think so, the game is targeted at Nintendo fans not PlayStation fans like bayonetta and xeno do

It personally isn't a system seller for me, but when I get a Wii U it could be a nice addition to my list.

Nope.. It looks like it's going to be an awesome game, but will it be a system seller? Nope!