"...I would prefer it if the music I love is not 'colonised' by rock and pop music".

Me too. But I would also prefer it if the music I love (probably far closer to yours than you realise) was listened to and understood by more than just a handful of aging baby boomers, and thus was given an opportunity to survive and flourish beyond their passing.

(Then again, does any of this ultimately matter? It does to me, though frankly at times I wish it didn't.)