As a new-ish player, I don't get the hand-wringing. As far as I can tell (my close reading skills having lapsed somewhat since Lit 101), the gist of the announcement is "Here's some new stuff- we pinky-swear it doesn't change any of the current stuff."
Now, there will always be people who hate the current stuff and were irrationally hoping the new stuff would herald a return to the old stuff. But what I don't understand is the seemingly large number of people (at least among people I follow here and on Twitter) who like the current stuff and yet are still "worried about Essentials." Worried about what? Worried that WotC is lying through their teeth and has a secret plan to totally sabotage the current stuff? Seems unlikely. Worried that Essentials won't be a magic silver bullet that has every 13-18 year old in the world playing D&D three times a week as an introduction to a lifetime of RPG goodness? Well, that hope seems irrational too.
From my usual standpoint of "hey, how does this affect ME", it looks likes it provides even more options for building the kind of game and character I want. I have a hard time getting worried about that.