Danny,
its a really great idea; I hope it goes ahead. There are plenty of forums for all parties with an interest in aviation to participate in, but I for one would certainly welcome a dedicated CHIRP type thread/site open to professional pilots only/ATCOs etc. More than willing to pay a subscription to a site where informed discussion can take place, withou threads degenerating into vilification. I think that the thread should not be viewable to non-qualifying members; there are plenty of other threads for general avaition discussion.
FB