I think HHVM was equivalent to what jQuery was to JavaScript. jQuery forced JavaScript to be better, and the better JavaScript becomes, the less jQuery is needed.
So if we get to a point where HHVM is completely irrelevant, it simply means "Mission Accomplished".
In terms of language, jQuery didn't innovate in anything though. It was a great framework mind you, but there's nothing special about it that influenced the choices in design for the more recent versions of JS.
I think querySelector and querySelectorAll are simply more generic versions of the traditional approach of using getElementById and getElementsByTagName, but it's possible that the greater versatility of $ influenced the later design of querySelector, indeed. Then again, it was not a jab at jQuery, which proved to be a fantastic tool for a decade in the field of web development.
So if we get to a point where HHVM is completely irrelevant, it simply means "Mission Accomplished".