> Seems to me like you want postgres to be able to just morph into any other type of database
No, I didn't mean that. I wouldn't want Postgres to add all of those features, because it would be lots of extra complexity to get some "simple" features.
I was pointing out some limitations of current systems (since most people are still in the denial stage, saying "what's wrong with the RDBMS?") The fundamental concept behind the NoSQL movement is "we need new tools in the toolbox", and there are a lot of "new tools" to explore.