I don't think the reason companies are moving to devops is to save on ops costs. At most companies their ops guys are cheaper than their devs. They're doing it because there was an unexploited gap between development and ops that has a lot of potential.
I've interviewed many developers and operations folks. The cheap ops folks are cheap for a reason: they can't code and therefore aren't going to be automating much of anything without a lot of effort. The good ones are just as expensive as developers, because that's what they actually are...
