IT and the business are indistinguishable. Even the tractor a farmer uses is as much computer as machine. IT better start providing value because, now more than ever, it's NOT about keeping the lights on and the equipment running. Technology and computing is the basic way to get work done and business owners/management/executives expect to have the tools the business needs to do the job as soon as the payment's been made.
It's not "as a service" any more...just service. Doesn't matter to the business if you (IT) are providing it or a disinterested 3rd party.