The future is always a guess. If you go back 30 years in music in film, the tolerance then is different than it is today. There is more variety in music in film today. Film scores are now a broad church. Producers are less freaked out by a wide score of music composed in a film. People now listen to a wider range of music so in relation there is more freedom for the composer to add a wider range. So the future is probably going to simply go wider as access to all kinds of music that people listen to become less judgemental.