Realistically speaking, it's probably a terrible idea.
There isn't much of a market, for one.
For two, a women's game would have to play much differently than a men's game, especially based on the actual state of women's soccer. It could be argued that it would be a less enjoyable game than the men's version, actually.
For three, there's no evidence that a women's soccer game will attract more women.
On the more optimistic side:
I know a decent amount of people that have gotten into soccer because they played FIFA. Ideally, a women's FIFA could bring much more attention to women's soccer.
Two, perhaps the state of women's soccer is due to it's lack of popularity. If you're selecting from a small pool of women, it's natural that you may not have the most talented people. If the game can inspire women to play soccer, it could cause greater talent to appear, which would improve women's soccer. This isn't to say that it would be like the men's game, but perhaps it could develop in a direction that is equally as good, yet different.
But the two optimistic points aren't guaranteeing a good women's game, or even one that sells; rather, they rely on the hope that women's soccer will be improved some years down the line as the result of this game's effort.
That hope could be worth it, but the odds are that it wouldn't be.