Does nobody remember Black & White, the old popular PC game made by Lion Head?
How much heat did they take for the name of their game?
None.
There's your answer, now stop being pessimistic.
This.
Now unless a new feature is that you play as the good team in White [and vice versa], then Nintendo will get no flank for this at all.
Of course, this is the interwebs, a haven that confirms that humanity still needs to mature in many such respects...
As for associations to White and Black, here's a bunch:
White projects purity, cleanliness, and neutrality. Doctors don white coats, brides traditionally were white gowns and a white picket fence surrounds a safe and happy home.
* aids mental clarity
* encourages us to clear clutter or obstacles
* evokes purification of thoughts or actions
* enables fresh beginnings
Black is authoritative and powerful; because black can evoke strong emotions too much can be overwhelming. A classic color for clothing possibly because it makes the wearer appear thinner and more sophisticated.
* feeling inconspicuous
* a restful emptiness
* mysterious evoking a sense of potential and possibility.
Both very opt choices for 'new beginnings', as this generation has been tooted to be for the series [even if I was fond on Sun and Moon, personally].