I'd like to add that this situation where music is increasingly being made by amateurs, is in my opinion healthy for the art of music, and also propably closer to how art has been made for the most of human existence.
Amateurs are less inclined to make choices for commercial reasons, which leads to them doing much more interesting things. (Sometimes slightly paradoxically finding commercial success due to being truly original.)
For example, I'm pretty sure that
Diablo Swing Orchestra or
Hellsongs would not exist if the people in them had considered the possibility of making money to begin with
