The commercial value of bike racing isn't a given - look at the number of sponsors currently getting out of the UK men's racing scene. I have a feeling that, with the exception of the Grand Tours, and the ToB, sponsors aren't convinced that there is a large and sustainable audience for cycle racing on mainstream, prime-time TV. It isn't exciting enough, and it takes too much commitment for a general audience to understand and give the time to. If that's the case for men's road racing, there's little incentive for sponsors to invest money in developing women's cycle racing - there are easier hits, such as women's football.
I would have thought that there may be some mileage in promoting TV Cyclocross, or a women's Tour Series as the racing is short, easy to understand, and fun, but no-one's grabbed that nettle yet.