The Paperclip Maximizer is only one of Nick Bostrom's stupid and outlandishly far-fetched ideas. In this case, the lack of consideration for geologic, energy and supply constraints is such a massive facepalm. And if I am wrong I guess no one will be here to say how stupid I was in saying this today.
It is an extremely weak metaphor for a weak class of unlikely doomsday scenarios. You don't need Occam's Razor to discount this cinema-induced malaise; clumsy use of a rusty can-opener would suffice.