I get what you're saying, and I appreciate it. But after having looked at some other boards yesterday and seen the things that were being said about people posting, well, without official NPD numbers from official sources, the conversation would likely devolve and not be about the numbers but rather about where the numbers came from. I can't imagine the end result would be what you'd want it to be. Some people would just rather not know. Those that are here, generally, do want to know and can (for the most part) talk about this stuff rationally and dispassionately. The general community though? Not sure.
If IGN or some major site did a story? Then sure, my opinion would be that a thread would be justified. But right now? No, I don't think the sources are solid enough for the public to accept. Know what I mean?