For what it's worth, reduce the number of big acts, dilute the focus on the Pyramid and Other, thereby spreading the footfall across the site. Also reducing the expense that comes with the big acts. It wouldn't affect the ability to sell out the festival, but it would attract a more diverse crowd.
I always find too many acts I want to see and after Friday lunchtime find myself almost exclusively watching bands and miss out on a lot of the unexpected treats...