Zelda, 3D World, Mario Kart and Smash, with no doubt, are system sellers. Some people complain about Pikmin or Donkey Kong, but what about Lost World?

A system seller or not?

Doubtful. Maybe if it gets incredible reviews it will sway a good chunk of people that were on the fence and/or waiting for enough good games, but I don't think it's going to sell many all by itself.

In japan? Probably never. But i think wii u will have some bump on sales when Sanic releases.

Nope. Sonic is not what he used to be. He needs to go back to his routes. Not all these clunky experiments they keep doing with him.

No i cant see it moving any units because how many are gonna see a Sonic game and be like "Wow i gotta buy a Wii U for that Sonic game!" Sonic's console moving days are long behind him but having said that i can see it selling a modest amount of copies.

3D sonic will never sell.

I'm a HUGE Sonic fan, but even I have to admit that he doesn't move hardware anymore. He's doing much better now than he was 5 years ago, and I'm always excited to hear about new Sonic news, even when it's on a platform I don't own (like Lost World on the Wii U), but the mass market doesn't flock to him anymore, and if they ever do again it probably won't be anytime soon, if for no other reason than that platformers as a whole aren't system sellers anymore. The only one who still comes close is Mario, and even his power has weakened; NSMBU is considered a fine 2D Mario platformer, and yet the Wii U has stagnated ever since the initial launch rush ended.

Pfft.

Sonic a system seller.

In all seriousness, a big no. The best selling Sonic titles are the Olympic Games ones with Mario, and excluding those the best selling recent Sonic title managed just over two and a half million units. Lost World will help move units, certainly, but it won't turn the Wii U from failing into a success.

It probably doesn't help that Lost World looks very similar to the recent 3D Mario titles.

A little bit dramatic

for me, that is the reason of its [modest] sucess.