I think a more fundamental reason is that RSSCloud solves the problem "I used to use RSS to read articles, but the 15 minute delay between the article being posted and me being able to skim it in my RSS reader was unacceptable" and that this is a problem real people do not have.
I think it was originally designed to reduce the server load caused by polling but now it has been dragged out of the attic to join the real-time hype wave. I agree about real people, though.
I think the problem it really solves is the Twitter problem rather than the RSS reader one. That is, if RSSCloud works as advertised, implementing a Twitter-scale infrastructure becomes pretty simple.
The article raises important issues re scaling, though I'd expect Wordpress and Winer are aware of them. I guess it remains to see if they are (and if Twitter-like apps are something people actually want)
Not quite. It's a problem they don't have any more. If RSSCloud had been supported from the start, I doubt Twitter would have been invented, because everyone would have just "microblogged" from their actual blogs in realtime.
I think a more fundamental reason is that PubSubHubDub solves the problem "I used to use RSS to read articles, but the 15 minute delay between the article being posted and me being able to skim it in my RSS reader was unacceptable" and that this is a problem real people do not have.
