naw, ultametly unlimited possibilites for the arrangement of sound waves.
Despite an education system (here in the US) that stresses standardized testing and minimizes the arts, the en vouge over-compressed sound, I still hear new bands all the time that are unique. I guess it comes down to how you define unique, but I'm thinking dictionary definition, so even two songs with the same progression sung by two seprate singers becomes unique...other thing to consider is the digital revolution has and will continue to provide new opportunities for new sound design.