To bolster this point, the bestselling album of all time is still Michael Jackson's Thriller, released in 1982. So it has been literally over 40 years and nothing else has topped that for mainstream popularity, musically speaking. It has sold over 70 million copies. The next nearest album is AC/DC's Back in Black, released in 1980, at 50 million copies, a 20 million copy difference. A present day musician would be over the moon to sell 20 million copies. If I'm reading the charts right, the only musician to break 30 million sales for an album since 2010 has been Adele.
So, while mainstream creations may be homogenizing, independent creators are finding a larger audience than ever before. I see that as a good thing.