Except for companies who makes speakers none of the universities or research centers are interested in loudspeaker tech advancements anymore. Every audio research is on machine learning, object based sound reproduction, wave field synthesis and binaural audio. Future of loudspeakes is going to be what we have now. With just some more materials for cones just like what it used to be since 70s another material,another cabinet shape another improvement claim.... Where in reality it's all sideways improvement.
I really wish someone invented anothermethod of producing sound that movie the air with a loudspeaker cone.