I'll certainly agree that the original blogging community could be cliquish, but the possibility of back-and-forth between creator and consumer existed when a blogger had hundreds or thousands of readers. When you have hundreds of thousands of readers - not so much.
As for Tumblr, I'd agree to its reasonably egalitarian nature, but I'd argue that for most people it doesn't represent "blogging" as a whole. As I said, it's not that egalitarian sub-communities don't exist, it's simply that their a near-insignificant subgroup of the whole.
Thinking about it, however, Facebook has provided a robust replacement for the "what I ate for breakfast today" type of blogs in a fashion that is probably superior to the original blogging platform.
My interests tended to be science and current affairs, for which there is now no shortage of good, popular content, but due to the massive success of the "winners", little opportunity for interaction while the rest are constantly fighting to attract enough readers to have a community at all.