RSS, rightly or wrongly, is being removed by a greater number of blogs and websites, who have found it's use dropping at a scary rate in the past 18 months. Thanks to Twitter (140 chars including link) and Facebook (500 chars max including link, but only 140 chars shown), people are no longer interested in consuming information in the way we did 5 years ago or actually 12 years ago with RSS was defined.

This approach violates all the experience we have become familiar with in blogs and especially RSS feeds

Can't the same be said for Twitter? the iPhone? Just because something is familiar, doesn't in any way make it the correct or modern way to do things.

themers PLEASE do not implement themes that break the standard UX for blog

There isn't any Standards. There are no hard and fast rules.
UX is about user experience, and that's ever evolving.
What users "expect" from today's blogs is massively different from 5 years ago. Massively.

Don't get me wrong, I love my RSS reader, but like any technology, it's only useful when a certain percentage of people use it. That's no longer the case. And that's probably not a bad thing.