timppu: I'm pretty sure this is nothing compared to the heydays of e.g. Napster, DC++ and Kazaa when everyone and his mother was sharing whatever they had. Then people learned to be careful, afraid of RIAA/MPAA etc., and now we are on the second phase of ISPs starting blocking whole sites etc. Who knows what next.
You honestly think piracy has dropped in the last 10 years? I know that neither of us is going to find numbers to back this up, but I find that impossible to believe.
timppu: I have quite many times failed to locate several older (and a bit obscure) titles in the past, after several attempts spanning over several months or years. I presume the reason is that there is very little demand for those items, or then they really have perished, at least from being online.
Obscure items can be hard to come by, but sometimes they surface without you expecting it. It's happened to me a few times.
Silly example: quite recently, a friend brought me from Berlin a perfectly obscure vinyl record of 80s Czech pop stars singing their hits in dreadful German, because she knows I like these kinds of things. The problem is, I don't have a gramophone. Just for fun, I tried searching for it -- and found the whole thing in mp3s on the blog of some German collector who I suspect must be mildly insane. I have since ripped the record myself, but this was something I honestly did not expect to be on the internet -- and yet it was.
And there are always the virtual abandonware museums, who do a lot of good work to preserve the rarer stuff. What Home of the Underdogs used to be, and Abandonia is today. As long as there is one copy somewhere in existence, nothing is lost; if someone knowledgeable gets a hold of this copy, rare may become common overnight.