Nicely done concept laywering.
What this entirely misses, as isn't unusual from this infomercialeering bunch, is what the consequences for the business are. Then again, perhaps they can be forgiven for businesses are pretty good at overlooking the direct parameters of importance (DPoI*), or perhaps that's because they've been listening to this bunch too long. Who is to say?
Anyhow. What happens if that Service Critical To Your Business suddenly up and vanishes in a puff of Cloud[tm] (Service as a Pipedream)? Can you afford that? Is the risk times the cost worth the savings (if any)? No? Stick to improving the services IT provides to your workers in-house then. That might be as simple as occasionally walking around the rest of the company and simply look what they're doing and how they're doing it. Not much opportunity to have spendy lunches expensed by sleazy salescritters. But then, who really wants to lunch with them anyway?
* Look ma, buzzword coining in action.