> saying that anything of value is released on CD already would be like saying that the personal correspondence of Poe, Emerson, Thoreau, etc is worthless because we already have their published books.

No, not at all. What I meant to imply is that if something is of worth culturally then at least some people would put some effort in keeping it alive. Like I said, it needn't be a CD. A pirated rip that is spread over bit torrent would be just as good.

The bible is still around because people painstakingly copied it not because some single entity kept one copy alive for good.

As far as general sounds are concerned, there are other places like freesound.org or archive.org. Thus I don't think soundlcoud has a monopoly on sound.