But HTML and CSS are done with that game. Shortly after the whole HTML5/CSS3 thing, the message was that there will be no HTML6/CSS4. There are reasons for that, like perhaps it's healthier for CSS modules to evolve independently of some global versioning number.
That said... as Dave says:
... the lull in excitement since those days is palpable....
People aren't equally excited about the big three languages of the web.
I’m on a bit of a quest to understand why these three technologies built to work together are so unequally yoked in popularity and their communities polarized from one another. One end of the spectrum experiences a boom while the other experiences a bust. The rising tide does not lift all boats.
Surely a major version number release for HTML and CSS could spark a ton of fresh enthusiasm.