[mmahemoff]

Yes it is, but the future is not evenly distributed, to paraphrase William Gibson. For many enterprises, even Ansible's current model is already way out there in the distant future.

Also, I think Ansible's idempotent model actually works nicely with immutable infrastructure. Why? For development of your stack. While messing around with it, you probably don't want to rebuild the whole thing from scratch. Of course you can play funny games with caching of remote packages and so on, but that's getting into Ansible territory anyway.

So I think a good model for immutable infrastructure is to use a tool like Ansible to develop the stack, then in production you would use the same tool to spin up immutable instances.

[Florin_Andrei]

Exactly. You still need something that holds a template of the stack somewhere. Ansible can play that role very well.