Here is an interesting article by Oorzhak Khunashtaar-ool from 1993 about his lifelong khoomei singing, and how it must be properly taught to the young to preserve correct technique and tradition.
Even back in 1993, he laments the introduction of pop music influences into khoomei.
Also, note the suggestion that a young female group should form, the daughters of Tuva, which came true with 'Tuva Kyzy'.