Really? When has BXVI publicly called for women's ordination or even admitted it is a posibility?
To the contrary he just denied the possibility of womenpriests again in his latest book.
The legal maxim is that silence gives consent. Americans tend to forget this because of our constitution, but the fifth amendment is a novelty in law.
I don't say that Benedict 16 has ever directly called for or even suggested women's ordination. In fact, he has repeatedly (through the years, at least when a cardinal) spoken and acted against women's ordination.
But he is supposed to be the supreme teacher now. Being silent in the face for such a call by a bishop is no longer an option. Even if he has never said anything positive about the subject in the past, his silence fosters an attitude among the other bishops, the theologians, and the laity (who have heard this bishop and others who have essentially said the same thing) that, well, the time might not be right but it will happen.
The longer he is silent, the louder his silence will be.