Well, I think it should be noted that this makes it clear that there's simply no way he is Satoshi. He claims to not "have the courage" to show proof that he has the keys, even when he claims to have shown Gavin and Jon proof of having those exact keys. The reality is that showing this proof is trivial, and if he wasn't willing to post it he wouldn't have claimed to be Satoshi at all - and if he actually was Satoshi, he would have posted this proof with his first post.
That said, if someone came out and proved themselves to be Satoshi, it would be a fairly big deal to the Bitcoin world. Satoshi himself has a lot of Bitcoins sitting under his control that he hasn't done anything with. Coupled with the fact that he was the original creator, his opinions would probably have a lot of weight behind them - and this is important when recognizing that Bitcoin right now is at a bit of a cross-roads, with people uncertain on how to proceed.
That said, I'm not heavily involved with Bitcoin, and while it was obvious to me (and most other people) that Wright isn't Satoshi, I wasn't yelling or calling for his head, and I don't really think there were that many other people doing that either - they were just a few loud mouths. All that said, you do have to keep in mind that, because of the power that Satoshi could wield, and the fact that some people have a lot invested in Bitcoin, I can understand the backlash over someone pretending to be Satoshi and potentially messing things up for everybody else.