Anecdote Time...
I've been playing Dungeons and Dragons for over thirty years, starting as a kid back in about '82. My younger sister sometimes played with me, but it wasn't really her thing. Still, she had some exposure...
Moving on, I have four kids. All four can tell you about Dungeons and Dragons, Pathfinder, Paizo, and about 3pp. They were exposed to it through me, but being the sort they are, they also glean information and my two sons in particular are avidly interested in the scene.
Back to my sister, she has two kids... They, through their cousins, my children, got interested in Pathfinder and they now have several Paizo products. They are about ten. They don't much care about the OGL yet, but they are informed as to where to shop for what they want. Their mother, who is not a player, still knows enough as to where to shop for what her children want...
So sure, there are people who don't know and don't care, but from my experience, it is plenty easy to get people interested and when they are interested they begin to find out about these things. And people do. Including mothers with kids who are getting into the hobby, the kids of those who are into the hobby, and the cousins of those who are into the hobby.
I realize that anecdotes don't really tell a lot about the larger picture, but that goes both ways. For groups where there is just one interested party, there are others where there are multiple interested parties. And even if the GM is still the only one informed, that still represents more than 1% of the gaming population.