I see a lot of people discussing whether splatoon 2 will be a success or not because it's a "wii u port", at first i didn't believe it would be as big as some people claim (tbone) but after thinking about it for a while i could see why Splatoon 2 can be huge in japan, maybe even surpassing some big franchises in the long run, the reasons aren't anything new or mindblowing but are still big, here's why:

- it's on a much more desirable system and popular.

- Different from the wii u version this will be the first portable splatoon.

- Multiplayer matches on the go using your phone as a hotspot.

- Local play with 8 switches.

- New coop mode with 8 switches.

  Reading my arguments might not seem huge differences but do you know what franchise splatoon is similar to in the past? My most beloved Capcom franchise, Monster Hunter.

  Monster hunter 1 and 2 was first released on the playstation 2, it had great potential but it never moved over 1 million units, their first entry reached a lifetime sales of 500k units while the second game reached 600k.

   That's when Capcom decided to give another chance to it and what did they do? exactly what nintendo is doing with splatoon 2 right now, they added coop mode and local play.  Capcom did that and released the monster hunter 2nd generation on japan (called mh freedom unite on US and EU), and what happened? On a portable with a userbase 3~4 lower than PS2, named PSP, MHFU managed to surpass 5 million units WW and became a hit bringing psp sales up on japan again, a true system seller.

   That's one of the reasons when whenever someone says a new MH will come exclusive to a home console, i laugh hard af, they tried with ps2, the biggest selling sony console and the best MH sold was 600k with MH2, they tried again, this time with the most successful nintendo home console, Wii, but stil...only managed to sell a bit more than 1 million units WW.

   My point is... portability and coop multiplayer made the MH franchise become what it is in japan and it might as well turn splatoon 2 into the big next thing on portable systems.

   Those are my points, let's discuss about it and apologies if my writing is anyhow off, i'm still learning english so... 

I feel like this requires very little explanation.

it's a no brainer but i still see a lot of people forgetting about the portability thing, that thing alone can create the word of mouth buzz way bigger than the wii u had.

Of course Splatoon 2 will sell well.....however, it's the lack of 3rd party software that will ultimately doom the Switch platform.

I don't get where you say people say it's a wii u port....it's not, soooo. whatever. anyway yeah its gonna smash japan given how popular the first one was.

Japan is already submitted to Nintendo Switch

 It didn't doom the 3DS, and in comparison switch has a better 3rd party line up than 3DS except for capcom, but E3 is right here to show us if switch will really bring 3rd party support or not. All i need is MH and dark souls portable, maybe gta V, the rest i prefer to play on pc or ps4.

I think it's pretty much guaranteed that Splatoon 2 will be a big hit in Japan.

A number of titles already on the Switch ARE third party...

Credits: Ōkami from neoGAF http://m.neogaf.com/showthread.php?t=1366249

     Splatoon just reached 4.8 million on a dead and far from portable console, it can go way higher than this on Switch.

I see 10 million+ for this one.