Re: If it's part of HTML5
"Well, you see, HTML 5 is NOT an official standard, yet."
Right you are, but then they can remove the DRM-enabling sandbox if EME gets dropped from the HTML5 draft.
That being said, why should they? You have to install the extra component yourself separately. I hate DRM as much as the next consumer, but not supporting it when every big name media provider requires it would be corporate suicide, whether it enters the standard or not. Boycotting DRM should be a decision left to the individual user, NOT the company that makes that user's web browser.
And as I said, you are indeed right that it's not a standard yet... but HTML 5.0 is all but finalized now and is expecting an official recommendation by the W3C later this year. From what I've been reading though, EME will probably be in the HTML 5.1 spec, expected in 2016. EME is not an official part of the standard yet, but do be careful with such blanket statements when the draft is almost ready to be released.