“When our generation goes, who’s going to know about this stuff?”
The better stuff will survive. The lightweight and mediocre stuff will generally be forgotten.
In classical music there were many many composers beside Bach, Beethoven, Mozart, Liszt, rachmaninoff, etc. If you dig you will find all sorts of generally forgotten stuff.
a thousand years from now, people while know who Bach was and will listen to him. If the music is good, it will be remembered. It is unfortunate that by the time modern-day copyright expires, a lot of really good music will be forgotten. Some will be rediscovered 50 years from now.