Talking about music evolution, we have to understand that music is composed by human, according to this: music evolution = human evolution. There are two types of human evolution: physiological and psychological. Music is a product of human mentality, that's why we will focus on psychological evolution. How do a composer generates the music? His mind recombines memories. And then he records it with help of computer or other stuff.
So, the solution of music evolution consists in composers personality, in their versatility. Here is an example: imagine a musician. His favourites are Astral Projection and he only listens to their albums. What this musician's music would sound simular to? Of cource, there are factors like equipment, technical skills, habitat area, etc., that will add some unique character to his sound, but see the truth, nowhere to take the music information in the brain other from the memory of music and sounds we've ever heard. Similarly, we can not speak the language that we have never heard. Comparing musical interests of different artists (who like the same music), probably we will notice that they are alike in sound. Returning to the subject of the evolution of Goa Trance, I think, to make something new, we have to like all genres and listen to all entire music, but that our work remained at the same goa trance, we should love him more than anything.