What a bummer that this history will be wiped off the face of the Earth within 50 years...once the Islamization of Europe is completed.
Very sad...the Europeans contributed so much, but then chose collective suicide.
It will only disappear if the US, Canada, Australia, et al, disappear too. No different than the classics of ancient Greece and Rome surviving the Visigoth occupation of Rome because they were kept in libraries in Ireland.
Organs can be rebuilt. The manuscripts might be lost, but in the US many film negatives for our treasures are gone and the movies still exist thanks to copies. I wouldn't worry about Bach's music being lost. I'd worry about the people who can actually stay awake through a 2 hour Bach only concert. I'm a classical musician, and trust me on this, there are other composers who were just as adventurous.
Maybe it's just a personal preference thing.