Infrastructure isn’t loosely coupled to other services but is the fundamental part of a system, whether that system is a service by itself or a part of a larger system.

Initiatives which call themselves Infrastructure as a Service (IaaS) or Service Oriented Infrastructure (SOI) are ICT provider and technology driven initiatives and are more capacity-oriented then service-oriented.

Infrastructure Architecture must focus on enabling service orientation instead of being service oriented, because enabling service orientation is providing the biggest value for the business! You can find a good example of what I mean at the Volvo truck site. Volvo is enabling service orientation by providing guidelines and resources for service providers like independent bodybuilders. And maybe Volvo trucks are in some ways service-oriented by themselves but that is hidden as it should be to the consumers of Volvo Trucks.

I agree but I would add that a clear goal is also very important!