While I agree that many women experience a loss of desire, I seriously doubt it
reaches 40 million a year. If that were the case, then it would leave no women
with any desire within a few years!
In most cases, loss of desire occurs due to a drop in hormones. However, you
state that your wife already had her hormones checked. Adding more hormones
when the levels are already normal would not then make a difference. A similar
situation occurs when men take testosterone despite normal levels in their
blood. When you are maxed out, you are maxed out.
One thing you did not mention is whether your wife is menopausal. If so, in
some cases, it can be helpful to supplement estrogen with androgens. It is often
the loss of androgens, not estrogen, that causes loss of desire.
So, the answer to your question is: no, the hormones should not really be
expected to increase her desire. You two may want to look at our libido page
to learn about other causes of low sexual desire. Best of luck to both of you.