Which service will end being king of the cloud? Infrastructure-as-a-service, platform-as-a-service, software-as-a-service? Regardless of which model ends up dominating in Enterprises, monitoring will play a proactive roll in determining success. Holding cloud providers accountable with SLA management is one way to ensure this:
As for who I think will end up being king of the hill, I am going to have to place my virtual coins on Software as a Service and here is why: I believe Infrastructure as a Service is going to have its place but will not be nearly as prevalent as Platform and Software as a Service.
You can read more here: King of the Cloud