The elephant in the room is that WotC said they would not produce 4.5.
WotC screwed up in ever saying that. For one thing, it cast 3.5 in a bad light by implying it was a mistake to produce it. It also put them in a position where any radical change to the design of the game called into question whether or not that change marked a broken promise by the company.
WotC, inadvertantly, set up the arguement on what Essentials is.
Before I take issue with you for this I'll ask if your intent was to make it seem like Essentials = 4.5 is a statement of fact by your last sentence. You're right that it was a mistake to say they wouldn't make 4.5, but what we're getting has nothing to do with that. We'd get "the sky is falling" crowd claiming that it's raining sheep at the most ridiculous things no matter what WotC says.