I don't think the analogy breaks down at the "never comes" part. I think that's fine. I know I have a list of future projects I want to get to, many of which I never will. Someone might have a similar list with "Learn Godot" on it. The title of the post is basically saying "Do it now, don't wait forever".
The analogy breaks down at where the control lies. In the play, the characters waiting have no control over when Godot arrives. So they're waiting on an external entity. With this article, the waiting is procrastination and the arrival is fully in control of the person doing the waiting.
A more fun play on words in my mind would be 'the wait for godot is over' or 'godot has finally arrived' but i understand how that wouldnt be as true to the spirit of the play