I think it depends on your definition of "Free Jazz." I don't really like the term in the first place because it's so limiting. But if we're going to say creative improvised music or whatever, there are still directions in which the art form can and will go, even in terms of energy playing. For example, through queering the inherent masculinity in high-octane tenor saxophone playing, Michael Foster is a significant new voice in this music. I've heard him with Weasel Walter, Andrew Barker, Ben Bennett, and in his duo project The New York Review of Cocksucking (which is electroacoustic improvisation) -- all excellent outfits. Some stylism, sure, but he's also plotting a way out of otherwise narrow routes. I've also heard some profoundly moving work by trumpeter Jaimie Branch's Fly Or Die group and Dave Rempis' Percussion Quartet (which continues to refine its own specific language). Not yet sure if any of these folks are geniuses and don't really care, but are they singular artists who work hard and have individual concepts? Yes indeed.
This gets back to my original thought re: genius, in that someone considered as such would have changed the world no matter the medium they were given. I can imagine Bill Dixon, Cecil Taylor, or Miles Davis being a hugely significant author, visual artist, scientist, choreographer, or whatever else. I could imagine David S. Ware being a significant drummer, pianist, or composer of strictly notated music, but perhaps not a playwright or political thinker.