RSSCloud or not -- I do happen to think that we need a push RSS solution -- what really bugs me is the fact that once again, we're inventing different standards to do the exact same thing. As if ATOM vs RSS wasn't enough, now we have RSSCloud + PubsubHubbub to worry about. PSHB already has Google behind it (all of Feedburner feeds support it), so I really fail to see what wordpress won by adopting RSSCloud.
Besides, while Dave is a brilliant guy, PSHB already has a lot more people working on it with open source hub and client implementations (heck, I wrote one for Ruby!).
Dave will never stand by and let a perfect solution replace an old poorly-specified ill-used mediocre one that he somewhat-falsely claimed to have invented. Instead he'll repeatedly change the canonical version of the spec live, without changing the version number or telling anyone (much less preserving the previous versions). It's super effective, at least for creating drama.
Besides, while Dave is a brilliant guy, PSHB already has a lot more people working on it with open source hub and client implementations (heck, I wrote one for Ruby!).