Not sure I get all that, I mean the success of any SOA is really its ability to live up to the business expectations set. Here are a few ways that others are measuring SOA, and the realities:

Services Under Management - Or, the number of services that a SOA will manage, abstract, orchestrate, and govern. While you can certainly have an impressive number of services, the size and complexity of your SOA really depends on the size and complexity of your services. Thus, the number of services really has little to do with the amount of work it took to develop or abstract those services or the value those services bring to the SOA. So, number of services at the very least, is a primitive metric.