So, most people agree that the point of music copyrights is to incentivize the creation of music.[1] Has there been a steep decline in the amount of music created since 2005 compared to the heyday of CDs, 1995-2005? Putting aside arguments along the lines of "pop music these days is so much worse than pop music when I was a teenager", is there any serious argument that music is of lower quality?

If not, shouldn't this be an argument for a reduction in copyright strength?

[1] Occasionally people argue that copyright protects the artists moral rights to the music, regardless of societal impact, but let's ignore that minority opinion.