I did see an encouraging note at the last Public Track Days in Litchfield Park AZ.
There were 23 Groups of 20 Bikes per each session. At least 2-3 Young Woman were on the Track on late model Sport Bikes and they were Gettin' it!
I also saw a tanden riding couple practicing high speed maneuvers. Having a backseat-er know the high speed cornering leans and how to react is a +1.