At the risk of sucking the fun out of a pretty funny joke, I think the underlying subtext is that established projects are failing to "grow up" -- i.e., that established, depended-on projects are hiding under the shield shield of a youthful 0.x version, when really, given how popular, old, and depended-on they are, they should embrace that responsibility and grow into 1.something.

(Though, on the other hand, maybe it's more just honest signaling of expectations. "We are a 0.x project, we value developer speed and a clean code-base more than backcompat or stability for users. We will NEVER grow up!" We could call it Peter Pan versioning.)