Very interesting topic. I agree with Beaky that arrangers of some sort will be around for a while. They are great writing tools, but not with the cache of old styles they now support. If they are to continue there will have to be a lot of newer styles and/or rhythms available. Maybe even a new style creating system would help - I know I've never edited or created a style, but I am intimidated by the thought. A simple set of templates... oh, what the hell do I know.