How do most professional musicians make their money? Teaching or similar activities. Few can make a living solely off being paid to perform. Fewer still can make a living from composition. This has always been the case.
The people who argue most vehemently in favor of copyright aren’t musicians but those who exploit musicians.
The better AI gets at creating music and the more such people turn to exploiting AI instead of musicians…that’s all upside in my book.
Musicians will continue to find ways to fund following their muse as they always have.