FoC, we're not a free market anymore. We're a herd market. The consumer no longer dictates what succeeds and what fails, the modern consumer just plain consumes without much question.
Exhibit A: Nintendo Wii
Actually the market was waiting there for years and Nintendo was first to answer the call. What follows now may be the actual exhibit you are looking for.
Ideally, there is the creator and the audience that is responsible for the quality and success of a product. In modern culture, these two entities rise to the top only briefly and are soon drowned out, then replaced by the corporation/producer element.
In the Wii example, the consumer entity existed first, which any research on an individual's part will tell you. It wasn't that a group like women naturally hated videogames, but that they were excluded from the focus of videogames and barely existed in the development world or media. Eventually some company was going to realize this and use it, it just happened to be Nintendo. Part of the reason it may have been Nintendo, because they really hadn't been marketing savvy in the recent past, was because of their creators within the company that were willing to try new things. So the creator entity came second, and it was a creator with a history of quality.
What happened post-Wii success was the glutton of shovelware that tried to cash in, which has made basically a handshake towards a new audience into a greed focused molestation of that audience. The consumer is not being informed, the consumer is kept dumb about game quality and it is no good for the Wii market. So, potentially the Wii can be an exhibit, but it also an example of how things should be, with consumers being heard and creators creating. Honestly, at this point anything will end up an exhibit until the consumer culture is changed.
Looking at PC Gaming, all you have is the same stuff being regurgitated, without creators creating or daring, and a consumer that just doesn't question at all. So you get narrower and narrower selection, and repackaged goods.