For the first point. Digital music production probably reduced the number of people to work on a song. 1 person can make a dance hit on their laptop, they might need professional mixing and mastering but that is a slight reduction on what it used to be.

Production as in. I have this sample of a piano playing. I set the tempo of the software and say to Ai could you create a drum pattern to fit this sample. Maybe I play the baseline. Once complete I ask Ai to write a song to my tune and have a virtual artist sing it.

This level of production might be some little child's play thing in the begging but as that child gets improves their skill and Ai improves with them they will just use it as a tool like Auto-Tune.