Umberto Eco said that when he was talking about the form of paper books.
But I think it raises a challenge for just about anyone who seeks to do something truly great in the world of design (in any of its forms):
Can you invent a thing for which no one will ever invent a better version of it?
Certainly, Dylan has done that for dozens of his songs.
And Frank Lloyd Wright did it with 'Falling Water'. No one will ever build a better version of it.
But Like A Rolling Stone and Falling Water are specific instances of general ideas (songs and houses). Not quite the same as Eco had in mind.
But you know what, that's probably worth aiming for regardless.
Can you make the thing you make next to be spoonlike in its unimprovableness?