When embarking on a cloud computing project should a Chaos Monkey be the first application?

Question

After reading Jeff Atwood's article "Working with the Chaos Monkey" and considering the implications of "Fallacies of Distributed Computing" it made me wonder if the first task of developers creating a cloud-based application should be to create a Chaos Monkey. Actually, given that even an entire data center can be lost within a cloud, the Chaos Gorilla may also be necessary to simulate a major outage.

Netflix certainly seem to believe so but I was wondering if their conclusions were shared by others here.

So, as the title says, when embarking on a cloud computing project should a Chaos Monkey be the first application?