The industry already is targeting products towards women and those products are of exceptionally poor quality. It's never good business sense to make crap no matter who you target it at. It's also never good business sense to abandon your existing market while you go looking for a new one.
Yes, and the author of the article believes that one of the reasons why they are of poor quality is the lack of women involved in the development process.
This is why your discrimination argument falls over as well as your attempts to compare it to other industries. In software engineering, the gender diversity of the development team has nothing to do with your ability to reach a target audience. In construction, the gender diversity of the crew has nothing to do with who's going to use the building or whatever they're constructing. The games industry, on the other hand, has much more in common with other entertainment industries... film, theater, tv, literature and the like. And in those sorts of fields, gender diversity... and all types of diversity, really... most certainly does have an effect on how well the product is able to reach certain target audiences.
The Wii shovelware has pretty much nothing to do with this either. Yes, lots of crap games are made for the Wii in an attempt to reach the new casual market that Nintendo has tapped. No, this has nothing to do with growing the market to target women gamers specifically. And in many ways, you're doing exactly what the article says people shouldn't be doing... drawing a line in the sand between casual games and hardcore games (ignoring the shovelware on BOTH sides). And equating the casual market with the women market, as you put it, is totally incorrect.
And finally, your point about abandoning the existing market to go for a new one makes absolutely no sense in this context. The games industry is in a period of very large growth, even with the economic hardships going on right now. And part of growth on that level is expanding into new markets. No one is suggesting abandoning existing markets and the idea didn't even cross my mind until you said it. Certainly the article didn't say anything of the sort.