Probably help the WiiU as much as Bloodborne will help PS4. A nice boost, but nothing long term.

1,800,000 lifetime, so, yeah.

Zero chance to be a system seller and zero chance to sell well to begin with. Bayo 1 players either have a PS4 or an X1 and won't spend 350€ for Bayo 2. Like me, they will enjoy PS4/X1 game while waiting until WiiU and Bayo 2 become a lot cheaper.

It's not much of a system seller by itself, but it's definitely a very strong exclusive addition to Wii U's library.

More than Windwaker and Donkey Kong put together? Oh you.

Oh, i. :3

Yes.

No system seller and it wont even break 1m in sales. People are just not being realistic calling it a system seller.

A combination of the following:

1. Exclusivity + Sequel. With the original selling about 2 million between the two versions, if a reasonable fraction were to want the new game, they'd have to get a Wii U for it (there's no alternative option available to them). This is different from the original game itself, which was an untested franchise and available on two different systems (thus the game could not help a person choose between PS3 and 360).

2. First-party. Nintendo is funding development of this title, and is allowing their IP to be featured as special content within it. Nintendo is therefore likely to provide a marketing push that they are much less likely to do for third-party titles.

3. Genre availability/timing. For this, I'm referring to the fact that fans of the general action-style game will be able to get both Hyrule Warriors and Bayonetta 2. While the two games have notable differences, the fundamental appeal of both games is there. As such, the appeal of the two games together will boost the benefit of each.

4. Fresh market. Wii U hasn't really appealed to the kinds of people who are likely to want games like Hyrule Warriors and Bayonetta before. Therefore, fans of those styles of games would have had little reason to pick up a Wii U before, but will now. This is especially true of Bayonetta, which doesn't exactly match the more "family friendly" styling of most Wii U titles.

5. Value. Not only is Bayonetta 2 being released, but Bayonetta 1 is being included, with improved graphics and added content.

Note that nobody is predicting a blockbuster. There's a difference between "blockbuster" and "system seller". If Bayonetta 2 manages to sell 1 million copies, and half of those are to new Wii U purchasers, then that's 500,000 Wii Us that were sold by Bayonetta 2.

Nope..not gonna happen.
though imo it should be more so than other ninty games that do better..

It will an absolutely fantastic game, no doubt about it. That's all that matters to me.
But a system seller? No.