It doesn't have to be like Kanye's album at that point in time to be a paradigm shift, though. If 1 artist didn't get big or some genre blow up then it would have just been filled by an infinite amount of others that we never heard. Even considering a single artist hitting it big there are how many that are never heard of? An AI could produce an equal number of artists and only has to win once every month/year/etc. I think this is similar to the million monkeys at a typewriter thing.